Hypothesis Carbon dosing for bacterial growth in planted aquaria

[Art]

Back in 2015, I did a ScapeFu podcast episode on Dosing Vinegar in Your Aquarium. It was based on the carbon dosing being used in reef aquaria but hypothesizing that it could have some benefits in the planted aquarium too. I still think it does but my thinking has evolved as to why. This is why this posted is marked as a "hypothesis" and should be taken as such instead of truth.

NB, I am not talking about adding a form of inorganic carbon such as glutaraldehyde or Excel for photosynthesis. Although, a byproduct of increased bacterial activity is more CO2 in the water that is expelled by the bacteria. Increasing bacterial populations in reef aquarium have been shown to decrease the aquarium's pH and it's thought to be the result of the metabolism of the bacteria.

Benefits:

• We are starting to understand that bacteria do more than just uptake nutrients. The compete with other organisms, some of which we want to limit, such as diatoms and dinoflagellates.
• They may inhibit some types of algae as algae spores will not have a place to colonize.
• They are very beneficial in converting waste in the aquarium and decreasing DOC. Many waste treatments facilities add them as part of their processes.
• There may be added benefits within the substrate ecosystem. More to be hypothesized here.
• Work with plants to absorb nutrients and assist in outcompeting algae. Especially useful during ammonia spikes as they will uptake the ammonia quicker than algae.
• May work at producing ammonium (NH4) in the planted aquarium thereby creating a readily available (and preferred) for of nitrogen for plants. See The Effect of Caffeine on the Bacterial Populations in a Freshwater Aquarium System.

Things to watch out for:

• Too much carbon may cause cyanobacteria in the aquarium. The risk differs with different types of carbon addition.
• Oxygen can be quickly depleted so supplemental oxygen via an air stone is recommended at the beginning.
• Some think that it may cause BBA in the aquarium. I am not in this camp as I never experienced BBA while I was dosing carbon. All aquariums have heterotrophic bacterial populations.
• The bacterial will take up nitrate and phosphate so you must be supplementing these and testing so that they don't bottom out. Not too dissimilar to the phosphate uptake when using soils for substrate.

Does anyone have any thoughts on this, even theoretical? When I set up my next planted aquarium, I will experiment with dosing carbon right from the beginning and see if I see any beneficial response during the startup phase.

 

[BigWave]

A few, well actually a lot of the European Liquid CO2 products contain vinegar as their carbon source. A big time shrimp breeder also markets a product that I swear has vinegar in it as a hair algae killer.

 

[Art]

This seems to have received a lot of views but few comments. Seems to not be an area of interest with planted tanks. I guess if it ain’t broke, why mess with it?

 

[Dennis Wong]

Seeing this made me a bit sad... RIP Linn~



I could try conducting some experiments since we have some spare tanks now.

 

[BigWave]

@Art, @Dennis Wong a few years ago I created this Honey dosing calculator. I admit I have never tried dosing it into any of my tanks. Kinda forgot
about it until you brought this subject up.

Created in LibreOffice on Linux Mint.

Dosing Honey

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I would take this with a grane of salt. As to the actual ppm values and interactions in the water coloumn who knows. Mind you Honey can not be any worse then some of the chemicals we dump in, cough cough excel cough cough....

I got the idea from some reef forum and paraphrased it. Don't remember where exactly. Not my words simply pulling info together.

Best Amino Acid for dosing in reef tanks
Elos
Red Sea Reef Energy A/B
Zeovit
Acro Power by 2 little fishes
Seachem Fuel
Honey
Honey, which is rich in either sugar and amino acids, can be used as carbon source and protein synthesis source. For a carbon source it might act just like Vodka.
Before dosing, I usually dilute the honey in fresh water in the ratio of 1:100 (honey/water). With the dilute solution prepared, 1 ml soultion is dosed per 25 gal (~100 liter). No negatives are observed to date. I start to dose honey since two years ago. Should be feasible to reef tanks. You can try this method with half the dosing amount in the beginning. I figured that using raw honey would be better than most aquarium Amino Acids products that is currently for sale because I figured that honey would be a better source of antioxidants/aminio acids

Side note: I personally know a few people in the Planted tank community that dose Black Strap Molasses with good results. The bacteria go nuts over the stuff.

 

[Dennis Wong]

Honey ? Isn't that expensive lol... Hmmm

 

[GreggZ]

Honey ? Isn't that expensive lol... Hmmm

I see a new market for you......APT Honey!

Have you seen the prices people charge for specialty honeys?? This stuff would be worth it's weight in gold! I'd go into production right away.