Originally Posted by FuelingFire
Yeah i'm going to Stop ferts for for awhile, and keep at it, Thanks Byron. And MoneyMitch The black brush isn't to bad at the moment its mostly on my driftwood and a few slow growing plants. I normally scrap it off and trim the leaf that has it the worse. But it is no where near as bad as the BGA.
Stay with my suggestion and keep us posted.
Just a quick comment on the first article Mitch linked, concerning the suggested treatment for cyanobacteria and brush algae.
The aquarium containing fish and plants is a closed system in which natural processes will occur. Every time the aquarist interferes no matter how, these processes will be affected. This can be good, as when we change the water, add fish food, etc. But they can also be dangerous. The aquarist must very carefully consider the ramifications of doing this or that, and weigh the consequences.
The fish are captive in this closed environment, and unlike in nature where they can usually escape something by swimming elsewhere, in the aquarium they cannot do this. My first concern is always the fish. Plants, algae, etc are secondary.
Adding nitrates in an attempt to combat brush algae is not advisable. We now know that fish are affected by nitrate, at varying levels depending upon the species. But the long-term effects of the fish remaining exposed to nitrates even at low levels are now beginning to be examined. Cichlids are known to have problems at nitrate levels of 20 ppm when this remains constant. Many soft water fish experience problems at lower levels. Nitrate should never be allowed to rise above 10 ppm, and keeping nitrates below this is even better. This should seem logical when one remembers that in their natural habitats, nitrates are so low they are usually undetectable. And nitrate is just another form of nitrogen, similar to ammonia and nitrite; all three are toxic to fish.
Algae even at its worst is not going to harm fish--though the cause when it is too high an organic load may; taking measures that can harm the fish just to deal with some algae is not very practical.