I just acquired a 12 gallon nano cube that is established. It came with 10 pounds of live rock, live sand, some purple mushrooms, some green and red striped mushrooms, toadstool and polyps. It currently has a couple of snails, what looks like a red legged hermit crab and 2 fish: A red firefish and a royal gramma.
Do I have room for a pair of clowns and/or a clown and a diamond goby? Or is the tank pretty much stocked with the two fish already in there?
I have tons of experience with freshwater but this is my first saltwater tank.