you know, it's really hard to even find a good fish store around me. I found out not that long ago my fav. fish store closed down and sold a bunch stuff cheap to loyal customers. I loved that place and i went there all the time. Is there anything else that would work as tankmates for a BGK?
Really? I always thought the eartheaters were pretty tame cichlids, in the profiles I've read regarding steindachneris they are listed as peaceful. Is it a male? Maybe if the steindachneris is put in the tank the same time as the BGK they will get along. Every fish is different.
The meanest fish I ever owed was a female firemouth, beat my convicts to a pulp, everything else in the tank, too. She was 5 inches and I had to bring her into the LFS because she wouldn't leave anything (even my hand!) alone!
If you are absolutely dead set on cichlids, I'd go with Apistograms (rams) or another really mild-mannered dwarf type. Besides aggression, my BGK's were always tough to feed even without active, voracious feeders around. You have to bring the food right to some specimens, so I always kept them with elephant noses and "baby whales" for a tank full of oddities.