ive had my red cap oranda in a cycled 20 gallon tank alone with 3 cory catfish for 2 months now with 50% weekly water changes. When i bought it, it had fish lice. After removing them and dealing with that the fish seemed happy.. 2 weeks later over the weekend i noticed a few red patches on her white skin and it looked alot like blood. The next day the red lines on its fins darkend and thickened and at the base its all red.. I did a 75% water change yesterday and so far theres been no change for better or worse... does anyone know what could be happening. The fish doesnt seem distressed at all and is acting normal