Good start
@Troylee 
What do you do with the water afterwards? I dump in a box of baking soda and watch it boil. I don’t know if it’s releasing chlorine gas, or oxygen or hydrogen or a mixture of those things but I don’t think I want to breathe it?
I often dump the bucket of pool acid in the toilet to avoid etching the driveway. It might work to take out the neighbors trees growing on the fence line? (Always recycle!)
Do you carefully pour the acid into the water, wear gloves and googles, - this stuff is not safe to have around things like cats and toddlers,
Best to use outside with good ventilation!
I have had it dissolve thin branches of coral so that they crumble. Heavy more solid boulders of aragonite is not to worry about, as you said. It does polish the rock and removes some organic materials from the surfaces, along with the surfaces.
The op needs to be careful to read the label for pool treatment and also the tips for handling corrosive substances, just to be safe.
I wonder if there is a thread on here to provide basic safety information for handling and home storage of the items that we often use in our hobby?
@Randy Holmes-Farley -link(s)
I wonder if any noobz would read them if they were(are) easy to find?