BL1
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Haha yea it is, my LFS has two in that are both already paired with pistols.
you can add them whenever, but that means you will have to give up another fish
Some things to keep in mind... :D
If you are keeping lps corals, it is best to keep hermits at a minimum. Also the hermits will kill any snails for a meal+shell.
The fire shrimp may eat polyps (zoanthus, mushrooms, star polyps, etc. as well as feather dusters.)
I do not recommend keeping chromis in tanks less than 40 gal because you must a decent # of them to diffuse aggression, and smaller tanks have less real estate for the fish.
The trapezia lives in total dependence to its host (acropora corals). It may likely die in short order without a host.
Start out w/ 1 snail per 10 gallons.