Very inexpensive algae scrapers.

[smlacy]

Hey there.

Go to the paint supply section of a hardware store and pick up some plastic putty knives (scrapers) The ones I've seen are yellow, and cost 59 cents for a small one and 99 cents for a big one. Great deal, and they work great. I don't know if they're safe for acrylic.

Steve

 

[fishfanatic2]

Suction cups also work great, especially the heater kind

 

[Anonymous]

Old credit cards work well and do not scratch.