Welcome to ScapeCrunch

We are ScapeCrunch, the place where planted aquarium hobbyists come to build relationships and support each other. When you're tired of doom scrolling, you've found your home here.

Social Feed

M
Last reply · posted in Fertilizing and Aquarium Chemistry
Hi all,

I’m experiencing a persistent issue in a high-tech planted aquarium and would appreciate advanced input.


Main symptom (very consistent):

  • New growth turns white under light
  • The same tissue regains green coloration in darkness
  • Older leaves are mostly unaffected

Plants most affected:

  • Eriocaulon species
  • Limnophila aromatica
  • Rotala macrandra variegated
Interestingly, most red plant groups are less affected, while green plant groups are clearly more affected.


System overview:

  • CO₂: high and stable
  • Hanna CO₂ test kit + pH checks used regularly
  • CO₂ estimated around 30–35 ppm
  • I do not think this is caused by pH instability
  • pH: low (~5.2–5.4), KH ~0
  • Light: high (WRGB, ~6 hours)
  • Substrate: ADA Amazonia (~6 months old)
  • Flow: moderate to good

Dosing routine (daily):

  • NO₃: ~2.5 ppm(%50 urea-%40 mgno3 - %10 kno3)
  • PO₄: ~0.25 ppm(kh2po4)
  • K: ~1 ppm (kcl-k2so4)
  • Fe (DTPA): ~0.025 ppm (mn 0,007-0,01)
GH is adjusted using CaCl₂ and MgSO₄.


Ca–Mg testing:
Tested multiple combinations:

  • 30 ppm Ca / 10 ppm Mg
  • 30 ppm Ca / 15 ppm Mg
  • 5 ppm Ca / 2 ppm Mg
  • 18 ppm Ca / 6 ppm Mg
  • 18 ppm Ca / 12 ppm Mg
  • 15 ppm Ca / 5 ppm Mg
  • 24 ppm Ca / 8 ppm Mg
→ Issue persists in all cases.


Iron testing:

  • Tested Fe forms: gluconate, DTPA, EDDHA, EDTA
  • Increased Fe dosing from ~0.025 ppm up to ~0.3 ppm
  • Photometer confirms ≥0.01 ppm Fe present
→ No improvement with any Fe form or level.


Fertilizers tested:

  • APT
  • MasterLine
  • Tropica
→ No meaningful difference.


Toxicity check:

  • No clear toxicity symptoms
  • Tested removal approaches (e.g. carbon)
→ No improvement


Additional observations (important):

  • Increasing overall fertilization (up to ~3×) made the issue worse
  • Increasing potassium made symptoms more pronounced
  • Reducing potassium slightly improved the situation
  • Plants do not show typical potassium deficiency symptoms
I also increased daily dosing from roughly:

  • 2.5 ppm NO₃ / 0.25 ppm PO₄ / 1 ppm K
    to as high as:
  • 6 ppm NO₃ / 0.6 ppm PO₄ / 3 ppm K
→ Plants became noticeably worse, not better.

Growth is not especially fast, and even with increased fertilization growth does not accelerate.

To me, this strongly suggests that this is not a simple nutrient shortage, but rather some form of transport / uptake limitation or ionic blockage.


Key observation:

  • Whitening occurs only under light
  • The same tissue partially recovers in darkness

Interpretation:
This does not behave like a typical deficiency, but rather a functional/transport limitation.

Possible explanation:

  • Under high light, Mg demand increases sharply
  • Mg cannot be delivered fast enough (possibly due to low pH or ionic competition)
  • In darkness, demand drops → color returns

Photos:
Included comparison photos showing:

  • ~10 minutes after lights on
  • ~7 hours into photoperiod
→ Clear visual difference in the same plants
The photo will be taken and added just before the lights go out.


Questions:

  1. Has anyone observed similar light/dark reversible chlorosis?
  2. Can very low pH (~5.2) significantly affect Mg transport?
  3. Could potassium be interfering with Mg uptake even at relatively low dosing?
  4. Why would green species be more affected than many red species?
  5. Any similar experiences in high-light / lean setups?

Currently testing:

  • Slightly higher Ca
  • Reduced light intensity
  • Controlled potassium
Will update results.

Thanks in advance.
9 Replies · 967 views
  • Like
Reactions: GreggZ
HardeeParty
Rockstar
Last reply · posted in Journals
Time to start a new thread.

I’ll fill in some details later, but I’m working on the hardscape now. Any and all criticism is appreciated. The vision is nothing more, and nothing less, than something appealing to the eye.

90cm x 30cm x 30cm Lifegard Aquatics ultra clear bookshelf tank. Buce and anubias on the hardscape, stems towards the back and center, mid to front carpet with some changes in shade and texture down to a flat grade on the right side of the tank.

Lily pipe inlet and skimmer will be in the back left corner with the outflow in the front left to hopefully achieve circular flow. I’ll be running an in-line diffuser. Light will be the P600 Pro that I regrettably did not upside to 900. Oh well. I’ll mount it high and hopefully it’ll have enough spread.

I have some dragon stone and red lava rock rubble I’ll use at the base to blend into the substrate, as well as some stratum I may or may not cap with.

IMG_1824.jpeg


IMG_1874.jpeg

IMG_1877.jpeg
IMG_1876.jpeg

IMG_1875.webp
284 Replies · 32320 views
P
Rockstar
Last reply · posted in Planted Aquarium Discussion
I have a wonderful stand of erio feather duster that has been algae free for well over a year.

Wnen I firts got it, tufts of bba would form on it on tips and I would just pull them off…

This summer my display tank has been struggling with simmering algae issues.

Still doing weekly 2/3 water changes, keeping nutrient levels and all stable, trimming away degraded leaves…

My erio is in sad shape…


image.webp

image.webp


I have tried spraying peroxide on it when doing water changes, laying the mass on a cafeteria tray and spraying on full strength and letting it set for 10 minutes before refilling to no avail.

I gave the fikters a thorough cleaning out, andremoved and reset plant groupings after thoroughly gravel vaccing the bdbs to remove organics…

Iam starting to think giving the erio a good hair cut way down low and letting it send up all new leaves.

Figure I would poll the audience before taking any such action…
7 Replies · 154 views
Capraquaria
Supporting I Donated 2026 AquaGirls
Last reply · posted in Specific Plant Discussions
I managed to acquire some Eriocaulon ratnagiricum. It should arrive early next week. I am pulling my 60U out of its extended dark start this weekend, and figured it would be an intriguing addition at the base of the large stones. (Not my image, this was from the seller):

eriocaulonratnagiricum.webp

I did read Dennis Wong's 'how to grow' for this species, which was very helpful, and will add some APT Jazz in the areas that I plant it as it seems it wants a fairly rich soil. Tank is 0KH, remineralized RO with APT Sky initially to dGH 6 when I initiated the dark start.

However, despite being sold as 'inert', the Sensei stone I acquired from AFA is most definitely not proving to be entirely inert. I haven't drained the tank yet, but will this weekend when I start planting, but this morning KH is holding at 0, but dGH is currently sitting at 10! There is a vein of quartz-like crystal running through the largest stone, presumably calcite, as it is driving the GH up, and leaving KH unaffected. Calcite reportedly can run in some Magura/Sensei stone. I am already reconsidering the type of shrimp for this tank based on the higher GH level, but I am wondering if anyone has experience with this plant in a tank with higher GH? This Erio is KH sensitive, and the tank is ok there, but I am wondering if the excess calcium in the water column, pushing that higher GH, might be less than ideal for this Eriocaulon?

I did consider sealing the vein of calcite with cyanoacrylate glue, and covering it in riccardia to maybe slow the leaching/rise in GH, but I think most of the rocks have at least some of this material running through them to varying degree, and I am expecting that the leaching could increase once the CO2 is running, and the pH drops. Regardless, if anyone has experience growing this lovely little spiky Erio, please share!
1 Replies · 36 views
JayP
Supporting I Donated 2026 Rockstar
Last reply · posted in Lounge
Well...let's spend more money! I had thought about attending Aquashella - Chicago a few months ago but decided to pass this year. When I was thinking about it, they still didn't have the specific VIP guest list posted. Out of curiosity, I checked today and to my surprise, the man himself, Yusuke Homma, will be presenting the masterclass on Saturday. I can't pass that up when it's only an 8 hour drive. Ticket purchased, room booked. Anyone else attending?
25 Replies · 751 views
Art
Art
Staff member I Donated 2026 Founding Member
· posted in Meet & Greet Forum
Welcome to ScapeCrunch, @drkenadams!
We would love to get to know you. Please tell us about yourself. What tank do you have?
0 Replies · 7 views
Art
Art
Staff member I Donated 2026 Founding Member
· posted in Meet & Greet Forum
Welcome to ScapeCrunch, @Proff01!
We would love to get to know you. Please tell us about yourself. What tank do you have?
0 Replies · 11 views
Art
Art
Staff member I Donated 2026 Founding Member
Last reply · posted in Forum News/Feedback
This is the future home for the announcements when someone obtains an achievement badge. Let the games begin!
2047 Replies · 72622 views
  • Like
Reactions: Kwyet
Kwyet
Supporting I Donated 2026 Rockstar
Last reply · posted in Journals
This tank was a Dutch-ish tank before we moved 2 months ago. This was one of its last pictures, very overgrown I know.

IMG_5970.webp

This time I want to make it a true Dutch, so anyone can chime in and help me. 🙂

After we moved, it ran low-tech with just a few tissue cultures until this week when I finally had time and materials to finish setting it up. This is what it looks like now:

IMG_6311.webp

I know there’s some bubbles showing in the vinyl cling. I’m having trouble reaching back there to smooth it out. I’ll have to think about how to fix that, although when the plants grow in it may not be visible anyway. I did read that you can have 1 rock in a Dutch scape, so I kept one. I may put Monte Carlo on it again, I haven’t decided.

So, details…

Tank: UNS 90U, 68 gallons

Light: Week Aqua P900 Pro, current settings R 40%, G 51%, B 20%, UV 0, Fan 100, Power 51%.
8 hours of light with 30 min ramp up/down
Par—no idea

Filtration: Fluval Fx4, currently running at 75%. Any higher blows the fish around. I expect to be able to increase it when the plants are grown in.

CO2: Yugang stainless steel reactor, 370 mm long, working really well. I had to turn down the CO2 a bit today because the drop was more than I expected (from degassed 7.4 to 5.9). I’ve already changed the end cap to the medium setting, but I think I’m just going to make further adjustments with the regulator. Call it laziness, but since there aren’t any double taps available for the Fx4 tubing that’s going to be easier for me. Anyway, I really like it. It’s completely silent and does its job well.

Substrate: Aqua Natural Galaxy sand, with a few Aquarium Coop root tabs.

Other: Oase CrystalSkim 350 skimmer, Kactoily 6-in-1 water quality monitor

Fertilizer: Until today I’ve just been using Easy Green. Today I installed the Chihiro’s dosing system with PPS-Pro, 6 ml macros and 3 ml micros daily. On water change day, I’ll add another 2 ml macros. I’m currently changing 20% of the water once a week. I’ll increase if necessary.

Parameters: Ammonia and Nitrite 0, Nitrate 10 ppm, gH 6, kH 2, TDS 222, 70-74 F

Plants (mostly from @Burr740 thanks!):

Leopard Val
Echinodorus Aflame
Hydrocotyle Tripartita (coming)
Penthorum Sedioides
Crypt Wendtii Sindoor
Lobelia cardinalis mini
Bacopa colorata
Rotala (? back left corner)
Limnophila wilsonii
Nymphae Peru Puerto Maldonade
Rotala macrandra Kochi
Nymphoides Taiwan

I’m not sure I like the Leopard Val in there. Should I put it in my 125 gallon instead, and move the Limnophila wilsonii to that spot?

Fish:

1 Honey Flame Gourami
4 Ember tetras
8 Otos
2 Pygmy sunfish
4 Red neon blue-eyed rainbowfish
9 Pygmy Cory catfish
9 male Lime Green Endlers
1 Leopard Danio (last of a group)
A few random Amano and Neocaridina shrimp and snails

The fish list will change as I get more tanks set up. I would like to end up with just the gourami, Otos, Rainbowfish (but more of them), and Pygmy Cories.

Well, that’s a start. Thanks for reading!
289 Replies · 30019 views
A
I Donated 2026
Last reply · posted in Equipment Discussions
This is going to be a weird doubt

I don’t keep surface agitation very high in my tank , mainly because it has an overflow & I find the returns pointed downwards keep the substrate much cleaner than the returns pointed upwards

I have 2 returns

One on the front left & other other on the back right , both pointed downwards,

This dosent let any debris settle & pushes everything into the overflow

The overflow is connected to a DIY sump , kept outside the house , which is basically 3 HDPE barrels (120 ltrs /30 gallons each)

The way the sump is designed ., there is hardly any surface movement in the sump too , all the outlets of the barrels are pushed deep down the next barrel & split in such a way that even tho 6500 ltrs per hour (1700gph) is being pumped through the barrels there is absolutely no splashing at all



For oxygenation there is a large Air pump with 4 outlets in the 2nd barrel ( the bio barrel) which is on a timer & switches on after CO2 & remains on till Co2 starts

CO2 is supplied by 2 cerges type reactors , one on each return line , installed after the 3rd barrel)


I was wondering if anyone has ever experimented with injecting air in the said reactor rather than co 2, if Co2 can be dissolved I am sure so can air

All I have to do is drill an extra hole in reactor, connect a tubing to an air pump & start the same on a timer

This way I can keep the tank oxygenated probably much more that what surface agitation would do
1 Replies · 53 views
Art
Art
Staff member I Donated 2026 Founding Member
· posted in Meet & Greet Forum
Welcome to ScapeCrunch, @mariagrace010!
We would love to get to know you. Please tell us about yourself. What tank do you have?
0 Replies · 12 views
Back
Top