infections

Hi Advice needed please. My pleco has a large portion of skin on his back that has peeled off. At first I thought it could be slightly burned as he mostly hides behind the heater. But as its worsened I fear it could be an infection. I am adding rock salt to the tank regularly, doing water...

My setut up is a planted Fuval flex 15 gallon tank with 10 Cardinal tetras, 10 Amano shrimp, 12 cherry shrimp and a Betta.. Water parameters are 5Gh, 5kh, Ph@ 7.0, Ammonia @ 0, Nitrites @ 0, Nitrates @ 10-15 ppm, TDS 380 ish....I have a growth in the Aquarium, that I cannot identify nor find...

Using walnut shells, leaves, extract... "which inhibit or promote recovery from aquatic bacterial, fungal, protozoan, and dinoflagellate diseases on the surface of or in the skin of the animal or from wounds and abrasions, or to control or eliminate metazoan parasites, or to control or eliminate...