can anyone identify this

[bumpypillow]

appeared over night, did a water change the day before and forgot to replug the heater in. I think the temperature swing made this flare up. He is on day 3 of a 4 day malachite green treatment (all my petco bought fish get it).

 

[Rocksor]

possibly a heater burn

 

[bumpypillow]

Its on his mouth too.

 

[Rocksor]

Didn't notice the mouth. Looks like some sort of gram negative bacteria. I would try a sulfa drug after the MG treatment is finished and been removed with water changes and running carbon for at least 24 hours.

 

[bumpypillow]

Theres one female cherry barb in the medic unit too, should i just treat her or go ahead and put her in the quarantine tank?

 

[Rocksor]

Best to put infected fish into a quarantine tank.