It's easier when you are already doing maintenance and weekly water changes. I currently have three tanks, a 135, a 60, and a 5 gallon pico. All three have coral and by far the most difficult tank is the pico, go bigger!
Thanks for the replies so far. I thought maybe there was a trick I am missing on water changes or something. Saw a guy say he had five tanks on here. I may be to anal to monitor more than 2.