i was just worried because i'm going out of town tomorrow and my friend is taking care of the tank. didn't want my water levels to go bad while i was away.
So let me understand this .
I should not stir my sand bed.
When I do all the dark nasty green sludge looking stuff is good for tank ??.
Or should I remove all this wast havent cleaned or vacumed for a long time.
THANKS & Happy Holidays