09-20-2010, 06:46 PM
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imo, go bigger. i started with a 10gallon, and i had to do something almost every day. i could never get more then 1 fish to live in it, and all the corals will just grow out of the tank. also the tank was very unstable and i was having to fill it with an inch of water every day. i would definatly recomend at least 30 gallons total (this includes sump)... if u like the look of nanos i would look into making a big sump. it would cost less for a big sump with small tank, but it seems that if you already have a big tank, why not use it. i feel that a 20gallon gives you enough room for a nice rockwork and places to put coral, you can also have more fish and it will be way more stable.
if you really want to go with a 10 gallon, get an auto top off, and a sump, even if its just a hang on back, its worth it.