maybe its just a bad type of algea, I kept fish for a couple of years now and never had these happen, usualy worst case senerial was a credit card and a good sponge. since I moved into this house (like 7-8month ago) with community well water I started getting this nasty algea that just wont come off, I spend so much time on the front of the glass I dont even care about the back and sides anymore![]()