I use a Reef Radiance Led with 2 simple aquaclear filters for for chemical and biological, plus I keep live rock in the frag tank also. The frag tank gallon wise I'm not real sure actually cause it was a built tank but it is 26x17x12. I use Purigen in the tank instead of skimming and it does great, I keep anything from sps to mushrooms in there, I use frag racks to my advantage to help with lower light corals.