A datnoid with an ebjd can work but it really depends on the individual fish, cichlids are pretty unpredictable when it comes to adding fish to their tank. It definitely can work but it's not a yes or no answer. Just observe your ebjd's behavior towards your other fish and that may help give you an idea if it could work. Also ATs do need brackish as they get older which is why I sold mine, just didn't want to do a brackish tank right now. Really any dat could live in a tank of those dimensions for a while, their growth slows the larger they get. I say go for it but expect to eventually upgrade or re-home depending what kind you get.