Cjvolitan,
personally i would not recommend the mandarin in a tank that small. Mandarins really need a bigger tank to support there feeding needs. when Dave was mentioning his, he was referring to a mature 26 gallon tank with lots of
LR. i would recommend a larger tank for you.. and if you do that, you are still going to have to wait about 6-8 months before adding the mandarin in the tank..
as you do research on mandarins, most people will recommend a 75 gallon tank, 100 LBS of
live rock and it to be at least a year old before adding a mandarin, so just be careful with this
Mandarins are beautiful, and they have large needs... make sure you do lots of homework on them to fully understand.. Dave was basically mentioning that they should be safe housed with ponies
on a final note.. Mandarins are not gobies, they are actually dragonettes.

Dave, anything else you want to add to this?