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#9
05-24-2016, 03:07 PM
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Looks like 2 types of algae which possibly could be changing the appearance of bubble algae colour to brown.
It could be diatoms and bubble algae on top of it. How old is the tank? What are your nitrate and phosphate levels? Emerald crabs eat bubble algae or you will need to carefully remove it without puncturing it. 
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