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#25
05-01-2020, 06:24 PM
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I would say it's a sponge. The tube with opening is called an operculum. Some of the sponges in my tank are really growing. If they get in the way, I just pull them off. But I find they are no match for any corals - they just stay in the shady spots or under the coral.
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 Maggie
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