Have you added any additives to the water in the tank other than perhaps the water conditioner? Is there an odd smell to the conditioner? Is it a new conditioner? o_o That is odd. Looks like an infection to be honest, the fins could have been from tailbiting (stress) but hard to tell with those pictures.
What are the levels in the water?
Is there any new decor in the tank that may be leaching? Rock, plant, etc?
Breed for the breed, not for the money; the words any REAL breeder would understand.
You must know nothing in order to know all, for all is nothing and nothing is for all.