10-10-2007, 05:25 PM
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If you just put the sand in, was it wet first (meaning, did you rinse it)? I assume you got sand approved for tank use.
It looks like the grains have not "wetted" properly, trapping air through the surface tension of the water...weird you say sometimes it gets worse when you mix it up...perhaps some sort of static cling...do like kateyoup says and rake it. If that doesn't work, try a metal fork
If nothing else works, take it out, put in a bucket with water and mix the heck out of it...