BAT Posted July 6, 2022 Share Posted July 6, 2022 I came home from vacation. A friend had been feeding the fish. I think the light might have been on for a time. what is this black and brown stuff? Link to comment Share on other sites More sharing options...
MrWestCoast Posted July 6, 2022 Share Posted July 6, 2022 Does it wipe off easily? If so, most likely Diatoms. 1 Link to comment Share on other sites More sharing options...
Gwallace Posted July 6, 2022 Share Posted July 6, 2022 Could be diatoms. I would just manually remove it and do a water change. Put the lights on a timer (or be diligent about on/off times). Fish sitters are notorious for leaving lights on and overfeeding. Link to comment Share on other sites More sharing options...
NathJK Posted July 6, 2022 Share Posted July 6, 2022 Yeah it's algae. Putting your light on a timer is a good start. Give it a wipe and regular water changes, should be sweet. Link to comment Share on other sites More sharing options...
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