I've had these 6 green lantern platys for a couple months now, issue free. Recently notice one of their mouths looks white and puffed up a bit? I decided to put some general cure into the tank and some aquarium salt. Should I be concerned? The fish are all acting and eating as normal.
50% water change weekly (prime dechlorinator)
I test water right before changing.
I always get 0 ammonia
Very little nitrate
Water is somewhat hard being from Ohio
X2 Aqua Clear 70s (sponge>filter floss> biorings)
Very small Round pea gravel substrate
Some bio rocks
1 white skirt tetra (plan on a getting a few more soon!)
6 green corydoras
2 julii corydoras
1 panda Cory
2 albino corydoras
I tried to add a clear picture of it. it's the one to the left of the tetra.