What color is the "cloud"?
For the 10 gal
, how did you cycle the tank? The sand that you used, was it purchased from the lfs
? If so, it is most likely light sand. Use your net to break apart the sand "bubbles". That's what we did for the sand that we purchased at the lfs
. For future tanks, I'd use pool filter sand. It's heavy and does not make the sand "bubbles". All you can really do is just break apart the bubbles.