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could be any number of things.Just looks like regular old algae to me. Give the gravel a good going over next time you clean your tank and it should look a lot better
I agree with this, when I used to use gravel it used to look like this after a while (which was algae) so I had to clean it often. I use sand in all my tanks now. Much better all roundJust looks like regular old algae to me. Give the gravel a good going over next time you clean your tank and it should look a lot better
can you tell us how long the tank has been running and cycled?
Just looks like regular old algae to me. Give the gravel a good going over next time you clean your tank and it should look a lot better