A hi fin what ?
Anyway, ignoring the unknwown fish, I currently keep .....
Geo.steindachneri
moonlight gourami
opaline gourami
female betta
platies
swordtail
black phantom tetras
bleeding heart tetras
angelfish
tangyinikan spiny eel
with large sevs. They are pretty easy fish to live with. The basic rule being that tankmates need to be large enough to not be food (ie. larger than neons etc). Also, sevs can sometimes be very difficult with each other. Some sevs simply will not tolerate other sevs or similar largish cichlids in their space (espec when they have established a territory), unless you have a very large space, or have several of them to diffuse aggression. LIke all cichlids they vary quite a lot in personality, tolerance aggression etc.
Anything that is safe with a sev will probably be fine with kribs too.