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Looks like an algae bloom. Is it the water or a film on the glass? How long has the tank been set up? What is your water change schedule? How long are your lights on each day?
Looks like an algae bloom. Is it the water or a film on the glass? How long has the tank been set up? What is your water change schedule? How long are your lights on each day?
That appears to be a green water algae bloom. To verify this put a little tank water into a white cup. If it looks green then it is a green water algae bloom. You have a couple choices in how to treat it. One is the black out method. This entails completely covering the tank, top, sides, bottom, so absolutely no light can enter the tank. Leave it like this for 3 days and NO peeking! This will break the black out cycle and you'll have to start all over again. This method can often work but if all the free floating algae isn't killed it will come back.
Then once this problem is eradicated you need to only run lights for 6-8 hours. I'd start at 6 and each week add 1/2 hour to you photoperiod. Build up to 8 hours or so as long as you don't get algae growth in your tank.