Don't know if you've been there yet, but nano-reef dot com is very helpful. I had a 10g w/ a fuge for a while. It was fun to have, but the evap was killing me. I didn't feel like buying a ATO (that would've been the most expensive thing on the tank, since I had everything else on hand). I had mushies, softies, a torch, frogspawn, zoas, cerith snails, nass. snails, margarita snails, pom-pom crab, but no fish. You've got plenty of light to put anything but SPS in there. But definitely look into nano-reef, and you'll see a million ideas for HOB fuges which will keep the macros out of the display.