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From your description, I'm guessing they're sponges. If so, they are harmless and a sign of a healthy tank.only appear in the darkened areas of the water column and 2-3 in the sump dark area
If these are indeed sponges it will be the 3 type I’ve found in the tank recentlyFrom your description, I'm guessing they're sponges. If so, they are harmless and a sign of a healthy tank.