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I set up my 29G Bio Cube a week ago today. I have 20lbs LR, live sand, 3 Emerald Crabs, 4 snails.

I have some black looking cocoons and some white looking cocoons on my live rock. Will this become anything? Is this normal?
 

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I'm not exactly sure what type of sponge it is, but I have the same sponge on one of my liver rock pieces. Its harmless and it feeds from the nutrients in your tank.
 
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