Can Anyone Tell Me What Type Of Rock This Is

[Turbodan]

When we bought our tank we were also offered this rock for it too which we took not knowing what it is.
 
Heres a couple of pics:
 

 
Any ideas what type it is and which tanks it can be used in?
 
Cheers

 

[ncguppy830]

no clue what type but you could probaly only put that in SW.

 

[ech0o]

That would be lava rock, can be used in either salt or freshwater, our brackish tank has a lot of lava rock in it because some pieces have some REALLY good caves.

 

[Turbodan]

Ahh cool, So can I use this in my tropical tank? Will it just need washing properly before it goes in as I think it had been used In a marine tank

 

[ech0o]

I would soak them in water for a few hours, change the water, soak, change the water, soak, etc....  Salt probably made its way deep into the rock but should be totally removable with soaking method.

 

[Turbodan]

I'll give that a go cheers

 

[BrianMcC]

agree with ech0o and I had in a malawj cjchlid set up