Hi Everyone I’ve been detecting my Datnoid with hole in the head. The water parameters are all good with 7.0-8.0 around the middle of with 0 ammonia, 0 nitrate , and 0 nitrite based on my api testing kit. They have not been eating for a few days . I’ve also seen them scratching themselves off of heater and tank .Does anyone know this type of disease with holes in the head and how can I cure it .