The JD goes for extremely long periods without eating, so has a badly sunken stomach, and lack of growth. When she does eat, she is very picky, so I usually give her what she is willing to eat. For example, she likes Aquascape's Koi Krunchies. I also sneak in some Cichlid Gold and Algae wafers. She asks for food constantly, but spits most of it all out and it ends up all over the tank and in the filter. I have no idea how she is still living with how little she eats. So needless to say, I like never see her poop. She does breathe a little on the heavy side, but she has done that from the day we got that so we thought that was unique to JDs or at least her.
Someone there told us that JD are prone to getting intestinal parasites or infections, so we tried a few different medications, and she would never accept the medicated food I attempted to give her. Same person also told us that some times these diseases are completely resistant to treatment, so after a year and a half of failing with different aquariums, tankmates, food, medicines, temperatures, lighting, etc...we thought that must be whats going on here and gave up.
While the GT was in there she ate well (expect the last month he had her stuck in a cave), but she never put on any bulk and her stomach was still terribly sunken. The GT ate like a pig, grew, normal poop, normal breathing, active and friendly while in there and for the last few weeks in his new tank.