I have kept breeding pairs of Oscars, Firemouths, convicts, and JD's (I also had a wild caught betta breeding project that i ran for 4 years). Granted I haven't had experience with EBJD's, but I'm not throwing out advice about anything that i haven't done and had success with. Speaking from my experience, I always had better luck removing the object that they breed on and transferring it to a bare bottom tank. When I would do this, i would siphon water directly from the breeding tank into the 10 gallon that i had set up under the breeder. All water changes I did to this 10 gallon tank were done using water from the breeding tank, not treated tap water. I never had a problem with losing fry or stressing out the parents. Sorry for not providing all of that information in my first post on this thread. Have I done it the other way and left the eggs in with the parents to hatch out in the same tank, yes. I'm just stating that from a control stand point that it is easier to see how successful the spawn is, and track the production, if they are removed and allowed to hatch out in a bare tank.
My experience might be outside of the norm, but it was successful for all of the fish that i had spawn and used this method. Just because I don't have over 1,000 posts doesn't mean that I don't have over 15 years of "actual experience" breeding various cichlids.