Is this hole in the head disease?? My boy was fine the last couple days, swimming/active and eating fine. Then I get up today and realize his color is faded a lot so I watch him in his tank for a bit and realize he’s just being lazy laying on the bottom of the tank and won’t swim/move much but he eventually moves/turns a bit and I see this hole/wound!!! My poor boy!!!! What is this. The hole looks like it’s pretty deep, not sure if he is Gona make it!!! Can anyone help me? What should I do for him?