i agree with jgentry mix up some fish and every now and then have some oddballs/rare
I dont really know any central american cichlids, but imo for south american
geophagus/satanoperca
maybe some crenicichla (larger ones or dwarfs)
maybe some dwarf cichlids like apistos, rams, etc.
severums (like you said)
festivums
maybe some wild type angelfish (altum/leopoldi/etc.)
and if you really want maybe get a few discus (I'm sure you dont want 20 discus if they don't sell because of price)
if festae are popular try to get some more females
i agree with jgentry's above quote
I dont really know any central american cichlids, but imo for south american
geophagus/satanoperca
maybe some crenicichla (larger ones or dwarfs)
maybe some dwarf cichlids like apistos, rams, etc.
severums (like you said)
festivums
maybe some wild type angelfish (altum/leopoldi/etc.)
and if you really want maybe get a few discus (I'm sure you dont want 20 discus if they don't sell because of price)
if festae are popular try to get some more females
jgentry
I would buy them in smallish groups until you know you can sell them
i agree with jgentry's above quote

(which in fact aren't that difficult to keep)