They way the females eyes are looking it looks like they are getting ammonia burn. Lethargic jag's usually means you need to up your water changes. I would suggest for the next 10 days you change 30 percent of the water every second day. Add aquarium salt . If you are worried they have caught something I would do a 70 % water change and pick up some paraguard or API General cure . Take out any carbon if you have some and treat the tank. You can also soak their pellets in Epsom salt and get rid of any parasites that way but you have to do this for 10 days. First try a large water change and see how they react to that after an hour and then go from there . Good luck !