co2 and cyanobacteria

amf17

Junior Poster
Jul 13, 2008
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i've start injecting co2(10ppm) into my low light 20 gallon tank and it seems like i've starting growing a lot of cyanobacteria. All my other nutrients seem to be in check. I'm wondering if the sudden boost of co2 has caused this. I've read that changing the level one nutrient (co2 in my case) in an established aquarium will sometimes cause an algae bloom because it takes the plants longer to start using the nutrient at the increased level. Does this sound possible???

If so, what should i do next??
 

VaughnH

Lifetime Charter Member
Lifetime Member
Jan 24, 2005
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Sacramento, CA
Adding CO2 causes the plants to grow faster, using up the nitrates which you are then under-dosing. And, low nitrates can lead to cyanobacteria (BGA). It is pretty simple, actually.