So as the title suggests, i'd like to know what your opinions are on my tetra who seems to have a white spot of scales towards his back and a belly that protrudes weirdly. He's been like this for a couple of months now and im curious as to if there are any diseases that i should worry ahbout that he could spread to new fish? Ammonia is around 0 to maybe 0.25 ppm if I stretch it a little, temp around 84, pH i recently lowered to 6.8, and that's it.