I love my large "Mag Float"! It was about $20, and well worth it! I bought it at LFS, but have seen it many places on-line and in Drs Foster Smith catalog! I use is twice a week. My tank is built in, so you can see one long side from the kitchen and the other from the family room. There is decorative woodwork on the one short end, so the Mag Float doesn't work there. It doesn't work on the other short end either, because it is next to a wall. I don't do anything with the short ends! I figure it leaves food for the snails! They sure do their job...always looks good!