No, I don't think I have HITH. One of my Tiger Oscars has a little pit directly above and between his eyes like the size of this mark ['] between the brackets, maybe a little smaller. I just noticed it one day but it hasn't progressed any, its just there. I think its just a mark. He's about 4 1/2 in long and he still has his appetite. He acts like an oscar and nothing has changed. I changed my water a couple days ago and I try to keep it clean as much as I can. And I haven't tested the water yet. He has an albino mate and they are very close. He/she has no such pit. They live in a 29 gal. tank with 7 small goldfish, a pleco, a betta, and a crab. I was just curious as to how HITH works cause I know how oscars are prone.