My Fahaka died today for some reason. Parameters have been good, really consistent his whole life. Just checked and all normal. He was great yesterday eating fine, swimming around just fine, looked happy to see us like always. I just recently started feeding him clams and mussels. Could he have had a reaction to the mussel? I fed it to him yesterday and he ate it like crazy like always. This morning he woke up with his mouth swollen and white. Almost looked foamy but not really foamy? All other fish in tank are doing great and seem normal. Anyone have any idea what couldve happened?