All of my corals are growing like weeds and I have been having pretty good luck selling frags. I would like to set up a frag tank. Luckily I have everything laying around to set another tank and sump. Is it possible to do a coral only tank if I feed it a small amount once a week or so? Or do I need at least one fish? The whole point of this is quality water and no bad algae. It will be a 20 tall frag tank, cpr overflow, 30 gallon sump full of live rock, mag 9 return, and a koralia 750.