Diatoms...problem just won't go away.

[The Grizz]

Originally Posted by Snufflupagus

There used to be little bubbles, but they are all gone. Now it's just a brownish orange mat that is only on the sand bed. They almost look like tiny round pebbles on the sand bed.

This is exactly what I had going on not that long ago, my problem solver was to ADD more Vertex Pellets as mine were almost depleted to nothing.