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I fully agree with Cliff - you need to do a LOT of homework before getting into saltwater...and it's easiest to ease into it vs. taking over a fully set-up tank...
Remember too - whenever you move a tank...you will have losses. It's rare to have 100% survival - so be prepared for that.
However...you have options: You can see if you can sell the larger fish off...or trade them (even if it's for credit) to the LFS...I'd take them to the LFS directly...vs. taking them home when you dismantle the tank...
Otherwise, if you wish to keep them, you'd need to invest in a larger tank, and that would defeat the purpose of buying this one.
55 g Goldfish Tank - 3 Fancies, 2 Comets
25 g Tropical Tank - Celestial Pearl Danio/Mixed