What type of rocks are these?

[astronomicallee123]

So I bought this rock today because I really liked the way it looked. It's from a local pet store but there was no tag and on the receipt it only said "Rock". I want to know what kind it is, and how to clean it and get it ready to go inside one of my aquariums. Thanks!

 

[imissmytruck]

The flash sorta makes it hard to tell...but to me it looks almost like lace rock. And I boil all my rock before putting in a tank.

 

[Tieberion]

Tough to tell from that pic, doesn't look like limestone or any other type of PH buffer. So best is to just boil it, soak it, tank it!

 

[bmarine]

It actually looks a little bit like texas holey rock.

 

[adammorrill]

It's cryptonite