That is one of my main concerns, because along with fish-keeping I gotta travel, too. So when I set my feef up, I did it in a way that...I think...enables me to go off to Italy or somewhere else and not worry...too much...about my reef. I think that the main "compromise" that I made in order to do that is no SPS. I have loads of soft coral and LPS but my only hard coral are hydnaphora and, that's it. Since I set up my tank, I left it three times for two weeks or more. My buddy cares for the tank (and my three freshwater tanks, too) and all he has to do is top off the sump and feed the fish in the tank....no coral feeding, no additives, no dosing. And he feeds flakes...just flakes. He's not a fishkeeper himself, so I don't want to ask too much of him and I figure the less done, the less chance of a complication. My skimmer is an Aqua-C EV-180 with the additional canister they offer so everything's all right with that for the two weeks. I leave in two weeks for a 12-day vacation...I'm still a little nervous....Oh, yeah...get a skimmer...and get a good one.