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The old hair algae problem. It can be a little hard to
get rid of, but here is one method:
1. Change water more frequently than normal for a
couple of weeks. Try twice per week. The object is to
bring down the nutrient levels. Alternatively, test for
iron, nitrate,and phosphate and change water
accordingly; one or more of these nutrients are the
key things you are trying to decrease right now.
2. Add algae-eating shrimp. I use glass or ghost
shrimp (same thing) at an amount of 1-2
shrimp/gallon. They live one-three months and eat
algae, especially hair algae along with fish food and
3. Cut back on feeding during the first two weeks of
Wait for hair algae to disappear. I had a situation
where I went away for work and had someone feed
my cat. Despite my instructions to the contrary, they
also fed the fish (arghh!). They overfed by apparently
a lot, and I had a mess when I returned.
The tank developed a bacterial (white) bloom, followed
by green water. Next came the hair algae, which can
persist really well. It took about four weeks to bring
everything back into balance; the addition of the
shrimp was the final blow to the algae.
Hope this helps.