I have alot of cynaobacteria (black hair algae). I use the prescribed dosages of Maracen 2 - about one week. I took out the carbon from the filter before starting the medicine. At the end of the medicine, directions say to do about a 1/3 water change. I did that. Unfortunately the black hair algae was almost untouched. I got to thinking and I use purigen in my canister. Could that have blocked the Maracen 2? If you don't think so, what do you all think prevented the Maracen from working?
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Black hair algae is not cyanobacteria and won't be affected by any antibiotics. You can kill it with hydrogen peroxide or Seachem Excel if it's on things you can't remove from the tank. Bleach and oxyclean can be used for dips on rocks and decor that you can remove from the tank. More info: