It's not that it is too small for 2 fish, lol, just 2 goldfish. It all depends on what kind of fish you get. Different fish have different bio loads, need different types of water and room to swim, etc.
That is a gorgeous tank though, and those are two gorgeous fish! If you do find somewhere for them you can start a thread on stocking options, or google "stocking for a (whatever size you have i forgot lol) tank" and you will get tons of options
That looks like maybe 15 or 20 US gal
from the pic, there is quite a bit you can do with it! Are those plants real? If not, they sure look like it