Upgrading to a 55 gallon

The other day, I found a free 55 gallon aquarium, and it is said that it includes "everything", but with no stand and no live sand/live rock. I will be picking it up this Saturday.

I plan on getting a second tomato clown, a Volitan Lionfish to house until I can upgrade to a bigger tank, and possibly some sort of Dwarf Angel. I might be limited to just the pair of Tomato clowns and the Volitan Lionfish, to cut down on the amount of water I will have to change.