sounds like an aggressive mix together....depends a lot on the size of the tank, order they are added and what else there is in the tank. They could easily be kept together if there is sufficient room for them to get away from each other. Clownfish and damsels belong in the same family and can be aggressive and dominant. The blue tang and hawkfish are less aggressive though can also be dominant....so it could be a mixed bag I wouldn't recommend it in a small tank but in one say 100g or so it would be okay.