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Those are pineapple sponges. They grow because there are silicates in the water. In a new tank there will be silicates and they will eventually go away, meaning new sponges will stop growing at some point. However, even though these are not bad for the tank, they will grow on everything until then. I would recommend removing them.Can anyone help ID these? They are polyps appearing here and there around the tank. Not sure if they are offshoots from the clove polyp or something else. Thanks
Very helpful. Thank you.Those are pineapple sponges. They grow because there are silicates in the water. In a new tank there will be silicates and they will eventually go away, meaning new sponges will stop growing at some point. However, even though these are not bad for the tank, they will grow on everything until then. I would recommend removing them.

