Welcome to ScapeCrunch, @markn2025!
We would love to get to know you. Please tell us about yourself. What tank do you have?
We would love to get to know you. Please tell us about yourself. What tank do you have?
Welcome to ScapeCrunch
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Hello Welcome, markn2025
- Thread starter Art
- Start date
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Fluval Roma 240
Fluval fx4
Here to try learn about co2 reactors!
Fluval fx4
Here to try learn about co2 reactors!
Here you go! 
The 2hrAquarist legend Dennis Wong tested the Hanna Test Kit vs a $3,000+ CO2 testing device and found accurate results in low kH aquasoil based tanks when compared. $30 for CO2 readings vs $3,000+!
It's a simple kit that comes with simple instructions, two differently sized vials for different detection ranges, a titration syringe phenolphthalein indicator, and an NaOH solution of some unknown concentration to titrate with.
For the range of detection on the Hanna CO2 test kit we want (0-50ppm):
Article 'Yugang CO2 Reactor - A Guide'
Contents:
Benefits of Yugang reactor
Calculate the reactor dimensions
Overflow mode, regulator mode, pH/CO2 controller
Overflow mode, step by step instruction
Regulator mode, pH/CO2 controller mode, step by...
- Yugang
- 20 min read
- Reaction score: 7
- Comments: 9
- Category: CO2 in the Planted Aquarium
The 2hrAquarist legend Dennis Wong tested the Hanna Test Kit vs a $3,000+ CO2 testing device and found accurate results in low kH aquasoil based tanks when compared. $30 for CO2 readings vs $3,000+!
It's a simple kit that comes with simple instructions, two differently sized vials for different detection ranges, a titration syringe phenolphthalein indicator, and an NaOH solution of some unknown concentration to titrate with.
For the range of detection on the Hanna CO2 test kit we want (0-50ppm):
- Add 10mL of aquarium water to the small flask. Add 1...
Thank you so much. I actually DMd yugang earlier to try understand the dimensions. My calculations show the reactor needs to be 5 metre long lol so I'm hoping they're wrong
Well, the Fluval Roma 240 surface area is listed as 120cm * 40cm or 4800 sq. cm. So,
- For a pH drop target 1.5, the Reactor_Surface_Area is estimated at Tank_Surface_Area 4800 / 17.7, or 271 sq. cm
- For a pH drop target 1.2, the Reactor_Surface_Area is estimated at Tank_Surface_Area 4800 / 35.4 or 135.5 sq cm, 27cm long x 5cm dia
- For a pH drop target 0.9, the Reactor_Surface_Area is estimated at Tank_Surface_Area 4800 / 70.8 or 68 sq cm, 13 cm long x 5cm dia
Haha well that makes a huge amount of sense. My calcs got me to 5.4m so I was out by a factor of 10
So,
Using a standard 5cm / 2" diameter PVC pipe, the length would need to be 271 / 5 = 54 cm, or 21".
- For a pH drop target 1.5, the Reactor_Surface_Area is estimated at Tank_Surface_Area 4800 / 17.7, or 271 sq. cm
- For a pH drop target 1.2, the Reactor_Surface_Area is estimated at Tank_Surface_Area 4800 / 35.4 or 135.5 sq cm, 27cm long x 5cm dia
- For a pH drop target 0.9, the Reactor_Surface_Area is estimated at Tank_Surface_Area 4800 / 70.8 or 68 sq cm, 13 cm long x 5cm dia
I'm not pushing too hard for growth so I think 1.2 ph sounds good, so I'll aim for 27cm. Thanks so much for the help
Do you have any experience doing this with a fluval fx4? It feels like a very small reactor to cope with the high levels of flow.
I'll do some more research into the mechanics of it and the parts I need but sounds doable
Yes it does need to be gentle flow, if you get noise or you feel like it's pushing too hard then you may benefit from putting it on a simple bypass, like this one
The word simple is relative
This looks great. Do you happen to have a parts list or guide for it? I assume the logic is that some flow goes through the smaller tube so there's a slower flow in the bigger tube? I would need the hose barbs to be 1 inch to fit the fx4
Have done. Thank you again
You bet!
