Great feedback, thanks.
I am planning a future upgrade, it will be at or less than 200 gallons. I was thinking of Vieja Heterospilus, Paratilapia Polleni, and Severum for potential stocking with several bichirs. Since they are the milder cichlids in general, maybe single males would work. I just would like to keep larger fish but not have a high level of aggression in the tank. So I sort of ruled out pairs (who might be aggressive even toward bichirs if spawning).
Would single males work potentially? I know it is always a guessing game and hit or miss with cichlids. My idea was to get small groups of each fish and pick and choose based on looks and temperament. I'd start with Heterospilus and Polleni because they grow really slowly. The Severum would likely be the last I'd add. I was thinking it would be cool to have different types of Sevs as I've read of others doing so, but maybe I'd just have to try and see how everyone mixed up. Or maybe just add a 4th species completely.