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Not so much the outside as the inside, but I'm sure some also got on the outside of the glass. The scale (or whatever it is) is on the inside, and you can feel it with your fingernail. (HCl won't hurt glass -- hydrochloric acid is often sold in glass vessels -- although HF, or hydrofluoric acid...

I allowed the tank to dry out so I could better see what's still on there. It's still there, and on all sides, although the acid did seem to reduce the scale on the front (I had it on its side with acid soaking on it). Here's a link to a pic (I propped up a black roofing shingle inside the tank...

Thank you for the replies. I tried vinegar and baking soda before breaking out the HCl ... no go. This one has me stumped. Just for grins, before I put it back in service, I'll try degreasing it with a strong base like NaOH and then try acid again, just in case there's something in the deposit...

Hello, all, new user here. I did a search on this question, but didn't find anything particularly useful. I have a 30-gallon glass tank that has sat neglected for several years. I'm trying to get it back up and running, so I cleaned it out real well and refilled, and discovered that there is...

Hello, all, New member here. Trying to get my long-neglected 30-gallon tank back up and running, and much looking forward to reading and learning from all of you. Best regards from Virginia, Red