lime based rock

[btuck]

While reading on another site, I came across a post that stated that if one isn't going to use LR that lime based rock was the best type to use. Is this correct. Limerock is basically calcium carbonate. Would this cause the Ph to spike in a tank comprised mainly of Limerock. What if any other problems could this cause.

TIA

 

[wrightme43]

Most land based rock including reef bones is much more dense, and from what I understand totally loaded with phosphate. If you want to test it, crush some up, and let is sit in a gallon bucket of saltwater mix for a couple of weeks. I may be totally wrong here, but that is what I understand to be true.

 

[MikeS]

Aragonite and Limestone are both basically calcite (calcium carbonate), but my main concern with using limestone would be that it tends to have more mineral impurities, like metals, ect. Both can have phospate issues due to runoff. And as Steve pointed out, you have a density issue as well which would be problematic if you intend to use this as a LR substitute for biological means. I'd skip it for use in a reef system.

MikeS

 

[btuck]

thanks for the info I hadn't planned on using it as my tanks are already up and running but this advice that was given didn't sound right so I wanted to verify.