I have my IM Nuvo 4 cycling right now. NH3 down to 0.25 from a high of 3! My tank evaporates about 1 cup off water a day which doesn't sound like much but it lowers the level in the return pump chamber almost down to the top of the pump. Is there an ATO appropriate for a tank this size. I can imagine salinity swings could get significant in a hurry with a tank this small. I only plan to keep Zoa's and maybe a plate coral since I'm so new at this. Lastly, is there any fish that could be kept in a tank this small? Maybe a Yasha's Goby and pistol shrimp combo?