Okay, I have successfully used the 2400 and 3200 grit abrasive cloth this morning, with no ill affect to the inhabitants. Not only did it work very well, it took the algae off in a flash! I did siphon water out near the work site to be on the safe side. All fish are fine, and are showing breeding colors as well! Susan _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member