Holestone?

[AquaHaven]

Currently setting up a nano reef and have a bunch of holestone laying around (never used). Is this stuff usable in a reef tank? Anyone has any experiences with this stone?

 

[MrGisonni]

No experience with it, but it is limestone. Now that being said, the process in which it was formed may have allowed other elements in, that could be problematic, thinking iron. I am not a geologist. Keep researching

 

[twentyleagues]

The white Texasholey rock? My uncle used it in his predator tank no issues other then it becoming covered in algae. In a reef not sure.