I had 6 malawi cichlids in my tank. The tank is still relatively new. Its about 4 weeks old now. Upon introducing the fish , everything was fine, well for the first 3 weeks. Then one of my fish started developing some strange bulge under its jaw. Causing it no to be able to open its mouth. All the others have been active and eating well. Until this monday that passed. I decided to give them a day of fasting. And did not feed them on monday. And ever since they have not been eating much. Or have been as active.
And then found one of my zebras dead this morning. (This is not the fish with the swollen mouth) none of the fish have any any signs of sickness , besides the one with the swollen mouth. I have attempted to add some treatment - called "heal all".
If u guys have any insight on my situation pls it will be highly appreciated thanks