by Getthejist » Sat Mar 24, 2012 2:53 pm
Hey guys i recently got a 12 gallon acrylic tank from a friend and there is this really weird substance on the back wall (back of the tank) and I'm struggling to get it off, but I don't want to scratch the arcylic. Some is also on the front and side walls. Somebody help please. I want to get this tank up and running as soon as possible. Also he kept shrimp in here so I don't know what the stuff could be. I'll post a picture soon

When in doubt get another tank.
I keep water the fish are just for decoration.