Join Date: Jan 2006
Location: Burnaby, BC, Canada
With Muriatic (Hydrochloric acid) depending on strength, you'll get fizz with even some "safe" carbonates like siderite (iron carbonate) and such which have low solubility in water, so as long as the rock and the acid are cool and you get minimal fizz, you're golden. Your only concern is if you get lots of fizz at room temperature.
Filstar pimp #59 (shhhh on the Eheim)