The title pretty much explains why I'm posting. We had a 55g MANY years ago and ended up getting a horrible green hair algae problem, so we just got rid of everything. We now have he fever again, but we are soo rusty. We found a 28g JBJ HQI tank for $100 or so. Obviously for the price, the tank is used. I want to clean it up - get rid of all the coralline algae build up on the back wall - I want it totally clean. I've been told to fill the tank up with water and put in a lot of distilled white vinegar and some elbow grease. Is this true? If so, how much? Any advise would be appreciated. Thanks!