Mark my tank is only a 20Long. I am thinking of going to a 40 Breeder. But going to have to wait until after Christmas when I get some $$$ freed up. I want a couple more fish as I am probably pushing my bioload now I have 3 damsels and a lawnmower blenny. Going to ugrade to MH/t-5 combo lighting. can't see putting more money in this tank anyway. Anyone know where I could get plans for a DIY sump? I have 2 spare 20's and want to make a sump out of one of them.