Hi all!
I have a 48"x24"x24" that is my first reef tank. I have a current sundial fixture - 48"x9.5" with 4 t5s: 2 Blues, 1 Actinic, 1 superwhite (all ATI bulbs)
My LFS told me that this was fine for zoos, mushrooms, leathers, etc. I have a zoo and a couple of mushrooms that are doing great...