I only gave it three stars because it didn't fit my aquarium. The plastic screws were useless, it kept slipping off the rim and the slits for the roots were too narrow. First of all, I had to use a blow torch to soften the hanger and make it wider; then I had to use double-sided tape to keep it from falling into the tank and finally, I had to cut out a few pieces of the slits so the roots of my peace lily could fit. My tank isn't rimless. The rim has a flat piece of plastic that sticks out about 1/4" on the inside (that's where the lid would sit). Other than those things, it worked like a charm.