Aragonite locally ?

[BMW Rider]

The main downside to using play sand, is that it is not a calcium based sand that is generally sold here, it is usually silicate sand. That stuff can really scratch up your glass if you happen to get it in your cleaner pad.

[allincuddy]

The only real way to dissolve the argonite in your tank, is to have a PH level so low that it would be rather difficult to grow anything in the tank. I think you would need a PH level of 7.5 for the argonite to disolve enough to cause an impact.
Might be wrong, but ?
Mark

[mark]

Can't comment where to find in bulk locally but calcium based sand definitely dissolves with normal tank pH. In my 75g, would need to add a layer every few months as would start seeing my LR supports.