I left it on the front glass, since I'm a sucker that spoils all my pets, even the fish.

They all seem to enjoy it there. It's covered in nibble holes now, I've seen the tang picking at it regularly. The blenny lays on it, the wrasse checks it for critters all the time. It breaks up the open space so the shy fish come up into the water column a bit more. I wouldn't mind it being there accept for the ugly veggie clip holding it up.