I could be wrong about this but from what I understand Lava rock (among others) isn't derirable to have in a reef tank. I believe they leach harmful metals into the water. FWIW.
Thiago,
Thank you for the heads up. My LFS(who sold it to me) never mentioned that it leeches. I have removed it all and all that is left in there is the live rock. Again THANK YOU!!
Lucy