Check your amonia level, it needs to be at 0! I just had a fish lying at the floor of the tank, we did a 75% water change and put in a bacterial cleaner supplement to reduse amonia and such. Our amonia level was at a 1.0-.1.3. Now at a 0. Miraculously our fishy us doing great now.My fish is lying on the floor but is still alive help me please!!
it’s a fire mouth cichlid I have three others in the tank aswell as one angelfish and two bristle nose plecos
Praying for your fishy.