well copper,lol,i transferredsome stuff in this tank from my other tank,a 55.when i went to a hundred,the rock and coral adn cc went in the one hundred.i then put about 2 to 2 and a half inches of sand on top of the cc.so far,so good.as far as lighting goes i have 380 watts of vhos.one actinic,2 10000 k's motameto.thanks jlm,still tryin to figure out how to get some of those green zoos for ya.whatcha got to trade?:jumping: