I recently found out (after losing 2 different sets of fish) that I had volcanic rock in my tank. I have since removed it but was wondering how long I needed to wait before adding fish once I get my tank better established. I added some live rock in place of the volcanic piece that I had in the tank. I am getting some live sand (a cup) from another aquarium this weekend. I have already added Biospira (live bacteria) after losing the first batch of fish. My water test perfectly but everytime I added fish they were dead in less than 12 hours. I know my tank re-cycled but even the LFS said that they should have lasted longer and even survived and I am wondering if it was due to the volcanic rock that I had in there. My tank has been up and running since March 17th. I was only able to add 4 lbs of live rock until I get paid again and was wondering if that would even make a difference with that small amount?