If it doesn't look green then it isn't an algea bloom. But test the water for Ammonia,Nitrite, and Nitrate. Do a 25% water change and insert a new filter cart. It sounds like your ammonia got a little high.
What it is, is micro. algea that is present in the water. It can zap the oxygen that the fish use's out of the water and the fish will dye to. The only way to get rid of it is to completely clean the tankout. That's why I asked you if your water's a little greenish.
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