Re: alge on back glass
Algae in an aquarium is natural. You cant rid your tank completely of it either. That being said, algae on the back wall is probably brown algae or green spot algae. Its a sign of a new tank, or imbalance. Too many nutrients in the water column and or gravel bed. Improper lighting (maybe direct light from the sun). It doesn't really harm your tank inhabitants one way or the other, but is unsightly.
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