Other then wanting tangs it is a good idea to decide what you want to stock with. Make a list and post it on here and then people can give more opions of what order, what goes together and reef safness.
My plan for my 240g stock is:
2-true percula clowns
1-yellow wrasse or some kind of small wrasse
1 Neon goby
1-Midas blenny
1-blue hippo tang(remember, already have her and she needs to be upgraded)
1-Copperbanded butterfly
3-Heniochus diphreutes
(3-7)- Lyertail anthias
1-Minic tang
1-Coral beauty or flame angel
1-I.O. sailfin tang
1- other tang-White cheek, clown, or naso
1-Green mandrine or possible mated pair.
This is my work in progress list for FOWLR tank. Maybe some ideas for you though?