I have 5 jacobfreibergi cichlids, 2-3" long. All have sunken bellies this morning until I fed them, but been having orange colored stringy poop for the last couple weeks. I feed them twice a day, what they can eat in a min or so. I use NLS for cichlids, my water perimeter are 0 for ammonia and nitrites, 40-80ppm for nitrates. I vac up poop once or twice a day with my eheim quick vac, 20% water change 1-3 a week depending how high nitrates are. I do intend to pick up some pothos soon to help keep nitrates down.