8 gallons doesn't leave much room as far as fish, personally if I were stocking it with fish I'd go with a small bottom goby like a yasha, then one of the following firefish, clown goby, possum wrasse, or small cardinal, something like a yellowstripe cardinal might get away with a pair of them. Can also do a couple nonCUC invert's, pompom crab, pistol shrimp, peppermint shrimp.
I'm prepping to setup an 8g evolve myself but I'm thinking all inverts, just got to find the right lighting and i can start setting it up.