So a friend dropped by a while bank and gave me a full 30g long setup, lights and everything. The tank hadn't been used in a long time and there's a great deal of stuff on the glass. I searched on here, got out the scrub brush and white vinegar, and went to town on it. No dice. I then filled it with 25 gallons of water, 4 gallons of white vinegar, and a gallon of muriatic acid. Again no dice. I drained it, and then went at it with some 4-0 steel wool I use on car windshields. No go. It appears to be calcium buildup, but I can't see how it can and have resisted all of my attempts at cleaning it. It's flush against the glass and is obviously water lines.
Any suggestions on cleaning this thing?
Any suggestions on cleaning this thing?