Pairs/Groups

[ponokareefer]

I am upgrading to a 240 gallon and wanting to add some pairs/groups of fish/inverts to the system. I know of some, but am looking for some additional ideas. Here's what I have
1. clownfish - have a pair, so not considering any more
2. common firefish(had a pair until one dissapeared) - too shy with larger fish though
3. pajama cardinal - have a breeding pair
4. bangaii cardinal - can they be mixed with pajama's?
5. pistol/goby pair - consider too small for my system as they will get "lost"
6. zebra eel - read on how to pair them and will probably try to add, but hard to find in my area
7. anthias's - consider to fragile and not a good long term idea
8. chromis's - kill each other off over time, so not considering
9. neon goby's - too short of a life span
10. cleaner shrimp - will be getting a pair
11. Genicanthus angel's - will try to find a pair
12. Siganus doliatus - try to find a pair
13. Flame Angel - try to find a pair

Are their any other reef safe fish/inverts I am missing out on?