As per our discussions, I think you could do nicely with a 20 gallon tank, I'm sure some people could find it in their hearts as well to maybe donate a frag or two to you when you have it all set up.... I myself will offer up one of my Xenia frags Canadian man sold me, they are doing well and I may be able to bring myself to sacrifice
one of those montipora digitata frags.
PC lighting on a 20 can do wonders, also overdriving some NO with a work horse.... Someone here did that with a 7 bow front and his tank is doing amazing.