Agree with Byron, parrot cichlids generally have difficulty competing for food.
It would be helpful if we knew whether your water tended towards the hard side or the soft side with making stocking recommendations.
Since you seem interested in cichlids, I will toss a few names out for review.
Softer water would be good for a lot of the smaller or less aggressive south American cichlids, such as:
Keyholes, Angelfish, Rams, preferably Bolivian Rams, Dwarf Flag Cichlid, Uaru Cichlids, nannacara anomala, aka golden dwarf cichlids, some of the easier apistogramma, like caucitoides, borelli, or Agassiz, Many of the smaller Geophagus, and dwarf acaras.
Obviously, there isn't enough room for all of the above in the tank, and there may be one or two combinations of the above that would be a bit risky.
With hard water, either African lake Malawi OR Tanjanyka cichlids, which I am no very familiar with, or Central American Cichlids tend to be a better option, again Leaning towards the less aggressive and smaller species if you want to keep multiple species, Most of the Herotilapia genus likely would work, but care may be needed to avoid the especially peaceful Rainbow Cichlid getting bullied.
Also Firemouths tend to be on the peaceful side for central American Cichlids.
Yellow Dwarf (formerly a cryproheros species, now amatitlania nanolutea) , Are aggressive toward their own kind, but relatively peaceful to other fish.
More aggressive CA cichlids that still might work are:
The T-bar Cichlid, Cryptoheros sajica, and also Cryptoheros Spilurus, also sold as Jade eyed Cichlid, and Cryptoheros cutteri, aka Cutter's or Blue-eyed Cichlid.
CA Cichlids in general tend to be more aggressive, are less likely to get along, and are best kept one to a species, as most tend to be even more aggressive to members of the same species, with the possible exception of Rainbows.
Orange chromides are another option for very hard water, and in fact do well in mildly brackish too, but these tend to do poorly with the central American species, being relatively peaceful.
