I've heard mixed things on lava rock, the general consensus seems to be not to use it.
http://www.thereeftank.com/forums/f6...tank-1754.html
another thing that helps is listing exactly what is in your tank
example powerheads, filters.
who makes them? what size?
example a maxijet 900 or 1200
or a tunze 9002 protein skimmer?
Information helps everyone help each other.