Review on biOrb Small Coral Ornament for 46116.0 Aquariums by Kathleen Melvin

So for those of you who have the same question as me; Yes, this is used to cover the top of the Biorb filter. There is a hole in the center of this decoration for the bubble tube to go through, allowing the decoration to lie flat on top of the lid. It does NOT reach the edge of the cover so you can still see some of it. That's why I'm giving it four stars. It's also a bit overpriced. However, it hides the filter cap fairly well, which was my top priority.