madcaow
Fish Fanatic

sorry for the crap piccie...
might be able to get anothery a bit better...
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diatoms are caused by lack of light and are often seen in new tanks.
it is not nessicary to remove affected leaves, just rub them with your fingers to remove the diatoms.
to cure the problem increase the light level, either add more light or have the existing light on for longer.