Peacock Bass get Way too big for a 90 and I dont think that would be a good mix at all.The Smallest Peacock Bass (the Royal) grows to just under 2 feet in length and the largest can grow to just over 3 feet in length with a huge mouth.They are Predators in their own right and I could see the JD getting punished.I haven't personally kept Peacock Bass but this seems a given to me.