And great! I just used mine I got from Greg @ Optimum Aquarium a couple weeks ago-and-well-all I can say is WOW! I had that sometimes annoying coralline growing all over my glass, and while I know coralline is great, on my display glass is a different story---in a matter of about 5 mins, I had my 135's front and side glasses completely free of coralline-oh-and without getting my hands the least bit wet. This is one of the best and most helpful tool I've used alongside the magfloat-and they clean my glass really well. Just thought I'd let all of ya'll know-