IME, the three regions have largely different aggression a levels. SA cichlids tend to be the least aggressive, Africans are very aggressive while CA (including jacks) fall somewhere in between. Now this is just a generalization and there are of course exceptions in every category, but I feel this is a fairly accurate generalization. As jacks are a large CA cichlid, they can be quite aggressive. EBJDs do tend to be much more peaceful than their normal jack siblings, but sometimes finding them suitable tankmates can be a challenge.
In a 55, there isn't room for more than one other cichlid. I would add a firemouth and some top dwelling, deep bodied dithers and call it done. You could also add a convict instead of a firemouth. Both are CA cichlids that are smaller than EBJDs and should be suitable tankmates. Keep in mind all cichlids have different personalities and even smaller cichlids can be bullies. Just make sure there is plenty of decor to break line of site and keep an eye on potential aggression. How big is your EBJD?
Plecos seem to be widely ignored by all cichlids. I have rarely seen a cichlid go after a pleco unless the pleco would fit in their mouth or the pleco was trying to suck on the cichlid.
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