Safe Material for Reef Tank?

[Kasey Grohowski]

For a few reasons I would like to get a pre built cave made with reef safe material, only problem is, I don't know what exactly is reef safe and what isn't.

 

[Jekyl]

For a few reasons I would like to get a pre built cave made with reef safe material, only problem is, I don't know what exactly is reef safe and what isn't.

Look up the recipe for making your own rocks. You can shape it any way you want to.