I have 52 gallon tank that was erected 2 weeks ago using a new ehiem filter and an old back hang on filter with bio wheel. The fish include rainbows, clown loaches, rainbow shark. peram have been good so far but i had an angle that died 3 days ago with really no sign of why. Now the rainbow sharks lower lip is swollen and redish in colour. I did treat the tank with prazi pro 4 days ago. retested the water this morning everything looks good temp is at 81 and ph 7.5. Any ideas. Also the fish were moved from a 40 gallon tank.
redish mouth
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