Hmm.... Two weeks ago I set up a 55 gallon with 160 watts of NO
florescent lighting on it and I got diatom algae. How much light
would you call sufficient? I think that the diatoms are a normal part
of any tank cycle. I did not have to wait two weeks though. Only
about three to four days.

I think diatoms are more related to excess silicates than light. New rocks,
new gravel, I get a bloom every time, and it always goes away on its own.
Never found light to be particularly related to it.

Rebecca
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