05-08-2008, 12:48 AM
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Planaria won't hurt your fish, nor will they kill them. Planaria, many believe, is the sign of a healthy tank.
Just let the tank cycle. I don't recall how old the set up was originally, but if you change substrates you will start another cycle. The glass cat needs company and current. Providing current many times is not conducive to using a sand substrate.
If you change substrates, try using a dark color. The darker colors have been proven to calm the fish. To prove this fact, most fish have a darker top and a lighter bottom. This is to confuse predators from above and below. This is particularly evident in many of the top water minnows. Thus the calming effect, they feel safer.