I ran a 4x55 on my 75 to start with. I have quite a few LPS
and even a brain that was on the sand. You could do some digitata too if you want some SPS
I say go for it. You will probably want bigger lights in a year or so though. If you get the Acro/clam bug like I did
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,