Filter media

[dtracy1119]

Just wondering what kind this is. It's not lava rock. Too light. I'm thinking more like Pulmite.

 

[Dsnakes]

Very hard to tell from looking at the rock. Just looks to be a piece of rubble. Where did you obtain it from?

 

[dtracy1119]

My wife surprised me with 2 fx5 canister filters bought used from facebook and this is what was in it for biological. It was in an African cichlid tank.