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John Freas

Mystery critters, what are they?

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These little white things have been growing in my sump.  Anybody recognize them?  They aren’t in the display tank AFAIK, and appear to be harmless other than the fact that they are multiplying slowly.

Cause for concern?  Celebration?  What the heck are they.

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They look like pineapple sponges. just a filter feeder. wont cause any harm unless they start to overtake a return pump.

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Nothing I can think of eats them. They don't harm anything like I said other than when they start getting to large #'s. I have only ever had them in the overflow and in the sump. Not to say they are in the display tank hidden in the LR.

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Agree on the pineapple sponge. They are a great filter feeder and help to clean the water of organics. There are certain fish and sea stars that will eat them, but they are not usually good for our reef tanks as that's all they eat. If the sponges get into your display they will stay in low to no light areas and not harm anything else. 

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