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Old 01-12-2011, 07:26 PM   #1
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Brown spots..

I have white sand in my aquarium and it's been running since Christmas and when I turn on the lights in the morning the sand will turn brown. It clears up over night.. Is there something maybe the sand doesn't like about my light?
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Old 01-12-2011, 07:33 PM   #2
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cyano algae maybe?
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Old 01-12-2011, 07:36 PM   #3
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needs specs please? water parameter, how old is the tank etc...if it's been recently cycled it is perfectly normal. most likely diatom. I had a diatom outbreak and it went away within the week.
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Old 01-12-2011, 08:15 PM   #4
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Diatoms is what it sounds like. It's a new tank I started it on Christmas. I have about 20lbs of live rock 1damsel and it's 36 gal
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Old 01-13-2011, 03:13 AM   #5
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There is two clear signs if its diatoms:
1. The brown spots will blow off very easily
2. They will trap lots of bubbles in them
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