i use 2 icecap 250w se 10k xm on my 40 breeder. same on 1 of my frag tanks 48x24x10 then 2 150W phoenix on other frag tank thats 2 20L's dont ask. and have 8 54w t-5s for another frag tank that just havent had time to setup which is also a 48x24x10, and 2 t-5's over my broodstock tanks and another 150w hqi phoenix over my growouts dont ask on that either. reflectors are spiders on the icecaps and pci on the phoenixs and nothing on my t-5's. im thinking of going to 250w de phoenix's on all tanks with the icecap pendents. just havent got the money yet.