I got my JD's about a year and a half ago, while i got the Festae about 9 months ago. I got 4 JD's at first and then these 2 paired off and started laying eggs so I got rid of the other 2. They haven't layed any eggs since the Festae has been in there which I'm ok with. The Festae shot up real fast since I got her at 1" she is a pig. She is about 1/2" to 1" bigger than the JD's but the dad JD is still definitely the big boss of the tank. Although they randomly chase each other or nip at each other there hasn't been any fights yet which is awesome.
Here's the big daddy:
Here's the big daddy: