Kelly Caldwell Posted December 19, 2020 Share Posted December 19, 2020 The top of my decor and front and back aquarium glass had what was either black algae or black mold on it. My water levels are on point, the best it’s ever been and my temp is right where it should be. It’s a 50 gallon tank. I do 15 to 20% water changes every week cause my zombie fish is a dirty gold fish. Today I took all the decor out cleaned it, did a 50% water change. Why would this be growing in my tank that bad? It was black. The tank is by a couple windows but no direct sunlight to the tank and at night I do turn the light on for a couple hours. The light is a fluorescent bulb, could this cause it and if so what is the best light to use or does it not need light? Thank you for any help! kelly Link to comment Share on other sites More sharing options...
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