saltwater is another one of my expertise lol. honestly if there is anyway you can get a little bigger tank like a 29 gal? it would be a lot better, first starting out you want the biggest you can afford/have space for because trust me if you enjoy it you will want a bigger tank eventually anyway, with the bigger tanks the system basically can "Take care of itself" everything will equal out after the cycle and with the weekly maitnence for the water quality which can be made easier with a doser if your running a large coral/fish load, if its a fish only tank a doser really is not needed. my current tank is a 180 gallon 6ft long tank, with about 30 different types of coral and praobably 12 kinds of fish. its a drilled tank with dual overflows into a 55 gallon sump, 4 250 watt metal halides a super chiller, auto top off, calcium reactor and tons of other stuff lol. a ten gallon is possible but it might not be an enjoyable experience for you but then again if your willing to do VERY REGULAR WATER CHANGES and not really have the variety of a bigger tank (Even a 20 or 29) it could work well. if you have any other ?'s feel free to pm me i might not be very old but i've been keeping salt since i was 7