Give the JD's plenty of hiding spaces and watch this dynamic closely. I've never heard of a tolerant, mild mannered Buttekoferi and of all the times i've heard of someone owning one they have all said they were aggressive at a small size. JD's simply can't stand up to one for very long. Good luck, I hope it works out, I've heard Buttekoferi's are great fish to own and JD's are great also.