Ah cool decent size, what kind of substrate do you have? Also when mixing bigger cichlids with smaller ones like the rams and apistos can be a bit problematic - the rams more so than the apistos.
A few of the larger cichlids that would work in that tank would be Severums, most species of geophagus, blue acaras, krobia, larger laetacaras, festivums, maybe a chocolate cichlid, firemouths and ellioti types - quite a lot really because you dont have any small fish that wont get eaten your options are pretty large.
Wills