you can buy magfloats that are for acrylic just make sure its labeled acrylic, if it says nothing about acrylic its a glass one.

http://www.jlaquatics.com/product/cl...ng+Magnet.html

http://www.jlaquatics.com/product/cl...22+x+6%22.html

http://www.jlaquatics.com/product/CL...-+Acrylic.html

Mag-Floats scratch the heck out of glass and acrylic. I despise those stupid things...you get one little grain of sand in there, or coralline algae, or those little tube worms like to live on the freakin magnet, and you get a scratch! I still use mine on my 33g though...now that it's scratched to heck it doesn't matter! :lol: I prefer the Kent ProScrapers.

you can avoid scratches by a mag-float by a) being careful not to come within an inch of the sand bed (use a credit card instead), b)covering the outside magnet (the one with the velvet cover rather than the bristles) with a cloth covering, c) not letting the feather dusters and coralline algae accumulate on the glass (be dilligent) and d) remove the mag-float from the tank after use. no guarantees though. :)

That pretty much takes away all the handiness of having the Mag-Float! ;) Which is why I will never buy one again!

to be more specific the srubber was like steel wool but plastic, and the sponge was from an lfs.

caution with kitchen gear, used a pad once on my old tank and though was plastic, where I used it turned the glass hazy (really fine scratches)