05-21-2007, 07:42 PM
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Diatom algae for sure. My tank has recently become full of it, all over the substrate, rocks, fake plants, etc..
Although in the last 2 weeks it has slowly begun to disappear. The white shells in my substrate are now visible, my rocks are becoming white again, it's getting thinner and thinner on my plants, and my ship mast, which was nearly 100% brown has thinned enough that the beige mast is now dominant.
I believe this is due to the amount of light I've cut down. It used to be on from 9am to like 12am, now it goes on far later, and turns off at roughly midnight.