Nice looking araguaiae darth. I like these fish a lot.
FYI, I've heard the thayeri get bigger and are more aggressive than the other species in the genus.
Yeah, I had a male that destroyed everything in his tank ... the female, four Noto dwarf pikes, and 10 zebra plecos one day while I was at work. Showing no prior aggression what so ever. Closest I've come to quitting the hobby.
Keyholes would be a good choice, though a lot of people consider them bland. They get larger than the cichlids, but tend to act more mellow which should allow them to coexist in a 30 long.

