I was investigating the tank last night nd I noticed this. It’s against the back wall of the tank. Somewhat shaded. Anyone kno what made it and should I b worried about or?
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Just looks like sponges to me. Nothing to be concerned about.
yep, I agree
Ok. I wasn’t sue if some kinda reef monster made a nest back there
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Haha. It does look kinda like a wasp’s nest.