Who Gives A Fish Forums

Thanks for all the suggestions, everyone. Gonna check the filter flow and test the heater first. Appreciate the help!

Noticed my Discus hanging out at the bottom of the tank a lot lately. Water params are good, 0 ammonia, 0 nitrite, nitrate around 10 ppm. Temp is steady at 84°F, pH 6.8. They're in a 75-gallon with sand substrate and some driftwood. Been feeding them beef heart mix and frozen bloodworms twice a day ...