so you are going with fish only and a peaceful community?
You can only have 1 clown unless it is a mated pair, blennies, damsels, anthias, chromis, small tangs (tangs need a long tank for swimming) small angel like coral beauty or flame angel (both easier to take care of and more hardy, but put those as last fish because your water needs to be in great conditions for an angel also for butterflys. DO ALOT of research on the speicies you are picking out.
You could also have a zebra eel (very peaceful) or snowflake eel and a chocolate chip star.
make a wish list with 7 to 10 fish and we will help you.