09-05-2012, 02:33 PM
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Originally Posted by Stormfish
Oh yes, it's hair algae. Some is red, most is green. In some areas it grows as little tufts that are impossible to remove, while in other areas it grows in long, slimy strands and clogs up the filter intakes. It grows ridiculously fast.
I believe I have put 2+2 together on why this happened. The plants in my tank (several large Amazon Sword, several Dwarf Swords, one HUGE crytocryne undulata, Cabomba, and a couple Hygro Kompacts) had grown so quickly I felt it necessary to do a serious pruning of them to give my fish some swimming room. I removed almost all of the Cabomba, the only fast growing plant, because it was driving me nuts. I also removed the Ozelot Sword I had because I didn't like the way it looked with the rest of the plants.
I believe that gave the algae in the tank the opportunity to take over. Putting algae chips in the tank twice a week for the Corydoras probably hasn't helped either.
I'm going to see about finding some Hygrophilia or Rotala for the tank to replace the removed Cabomba with.
I would bet the tufts are brush algae, this is very common around filter intakes and outflows (the increased current is said to promote this), and it forms on the edges of leaves and then spreads. It is generally black in appearance, though technically it is a red algae. I have this, it is the only algae I have to battle now and then.
Light has to be the control, no more intensity or duration than will match the nutrients. And don't worry about the algae tabs for the corys; other than by overfeeding any food, this is not going to cause algae.