I just picked up a 55 gallon and will soon pick up a jack or gt. I really want both would they both live happily in a 55 gallon? Would they even get along with each other?
Might work might not work. Depends on the fish. Id personally take a look at full grown Jack Dempseys and see if you really plan to house one in a 55 for life... Ive seen 10" JD's before they are intense fish.
Every fish is different, but I know quite a few people with those two fish together, and they do fine. I have a GT and a JD in my 75 with a couple other fish and they don't even pay attention to each other. They should be fine for 18 months or so in a 55 gallon before needing to upgrade.
That was one of my best combos. Both beautiful, and both able to hold their own. Theu would ocassionali liplock, but as long one doesn't dominate the other it may work. As mentioned it depends on the fish. These were mine.
I would go ahead and go with both. They generally have pretty similar temperment, just have good filtration and nice hiding places for them. If you see major problems, then throw in a school of dither fish like silver dollars or something along those lines.