adding another clown fish

[johnny_gitara]

hello,
i've been having a 20 gal tank with a clown fish (Amphiprion percula) for month and a half now. he is only fish in the tank. his roomates are a cleaner shrimp, two hermit crabs, other creatures that hide in live rock... after a lot of reading online some say it's okay to add another clown, some say it's not. i would really want to get another one so that the one i have is not alone. what do you think?
thanks in advance

[leebca]

That tank is maxed out for marine lifeforms that generate nitrogen wastes (fish, mobile inverts, etc.). A pair of the small-kind of Anemonefishes should be in no less than a 29 and then, no hermits.

The details for the above are given here: Fish Stocking Limit - for FO and FOWLR