Very likely, and this is probably a bacterial infection and even looks like result of copper poisoning. If no copper was used, similar Infections can be caused by either Gram‐positive or Gram-negative bacteria. Gram-negative infections are typically more virulent, and more common in marine fish. Bacterial infections are often "secondary" to a preexisting parasitic or worm infestation. Contibuting to can be poor water quality, open wounds and nutritional deficiency (which lowers the natural immune system) are all possible contributing factors of infection.
The Best treatment for a bacterial infection is a broad-spectrum antibiotic while also feeding Metroplex, Kanaplex, and Furan-2 are a great broad-spectrum antibiotic treatment when used together. Dose the kana & furan-2 at the same time, and the metro an hour before or after.
Antibiotic- Maracyn 2 or Ruby rally pro
Diet will play a role as well as optimum water quailty. The fact it happened so sudden is what needs to be identified.
Foods:
LRS Herbivore diet
spirulina brine shrimp
Formula 2 flake and frozen
Hikari veggie diet
mysis shrimp
Add selcon vitamins to its foods 2-3X per week and on alternating days- Garlic extract which helps with immunity health.
Ammonia < .03
Nitrate < .04
salinity 1.024-1.025
ph 8.1-8.3
temp 77-79
IF YOURE USING API TEST KIT, YOU MAY BE GETTING FALSE READINGS and then i would ENCOURAGE YOU to take a water sample to a trusted LFS that does Not use API kits and see what readings they come up with
