Unless its first thing in the morning and the fish are sleeping, laying on the bottom is never good. Change water and get your water tested ASAP.
If the tank is less than 3 months old, always look to water problems first, before suspecting a disease. Even if you have a disease, the fish will never get well in poisoned water.
If the water turns out ok. then post back.
Are these fish "blood parrot cichlid" that is actually a hybrid? Hybrids are prone to birth defects (not likely if they were ok when you got them) and digestive problems. Have you been feeding worms?
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