Does this look like hole in the head guys I mean I have had a case once before that fish lost ita appetite was hiding all the time this one is active comes out during feeding time just did an 80% water change last week and used a filter from a stable tank to add beneficial bacteria to the tank could this be hole in the head or a wound from a fight tank mates include green Texas,convict,green terror , tilapia buttikoferi and jaguar cichlids