I wouldn't keep with exodons. They are nipping fish and tolerate each other better. Charax and similar fish like it are rare and I wouldn't dare try it. Plus exodons will nip on fish as them or bigger.
Charax and similar can be kept with other fish the same size. They will go after smaller fish, neons for example, but not the same size as themselves generally.
They are predatory. Smaller fish beware. Get about 6 inches. School together. Will take most foods without a problem. They are temp sensitive from prior experience and Ich prone.