[Gomer]

anything acidic would work. if the buildup is below the water line, it will slowly re-desolve.

 

[Gomer]

I would just use plain vinegar. It is probably the safest thing to use.

There are all sorts of stronger acids that would also work, but I like to keep things easy and safe

I suppose you could use some diluted muriotic (sp?) acid (which is diluted HCl).

 

[Gomer]

vinegar should work like a charm. Just need to have a little patience. I suppose you could use lime-away if you have the tank gutted. As long as you rinse well, ther ehsouldn't be an issue.

hmm...I suppose you could use some CO2 to help you

fill the tank completely with H2O and desolve enough CO2 to crash the pH

if that can disolve snail shells, no reason it shouldn't do the deposits too

partially, but not completely joking on the latest method