I took this from a the fish profile here on the forum "These cichlids make excellent tankmates for most mildly and moderately aggressive mbuna, aulonocara, and haplichromines from lake Malawi."
I don't belive in that other stuff that other forum said, although I belive they may be one of the more peaceful mbuna. I really don't think any African cichlids should be kept in a community tank that small, even Kribs have been known to kill community fish and they are supposedly quite peaceful. Did it tell you the minimum size tank for the fish? I hear 30g minimum, and I don't think thats 30g, whats is it exactly? Please try to get some more diffrent things to add into the tank, they need a bunch of diffrent hiding places, and the Yoyo's may also benefit from it.
its a 200 litre tank, not sure how many gallons, u.s is different then uk.
maybe our australian bred fish are more chilled out than other countries? haha,
i want to think positive.
Sorry to tell you but there is no way that tank is 52 gallons. Try to re home the balas before you give them any major damage, the tank looks like it may be 20g, and the only fish that don't get any bigger then 5 or 6' are the neons, which are the only ones suited in size to stay there. Make sure though, measure the tanks L W and H and find out the amont it is.