Yeah I originally thought she had some kind of burn because she was yellow blotchy and very veiny. She's been losing weight over 10 weeks for some reason but her appetite crashed completely the previous two weeks but its back on track. There has been three previous posts about her health in these two weeks if you'd like to read back on them.
However it was not a chemical burn. Ammonia was zero, nitrite was zero and nitrate was a very pale orange/ deep yellow so it wasn't that high and that was after a week and a bit without water change. I used two different tests because I was so sure it was ammonia burn but both companies came with the same readings. This was done when I saw a change few weeks ago, since then I've been monitoring water tests every three days and everything is zero. Ph is about 7.4
Shes stopped floating and her skin isn't as bad as it was, and has started eating. However her tank mate was so cruisy and happy. No floating, eating like a monster, quite happy (no signs of stress in gills, tails or behavior) no skin irritation that I could see.