I have 3 gouramis....2 dwarf blue and a fire. The 2 dwarfs are orange and blue striped with one being more blue and one being more orange. The past week, my more blue one got very teal under his mouth and neck. It almost looked like he swam through something and like it wasn't part of him. I noticed a couple days ago that it cleared up but now the mostly orange one has also darkened in the same spot. They also seem to be more active and chasing each other around. I noticed some missing color spots on my fire gourami but not sure if it is due to nipping or if it was always there. I don't know the sexes of the fish and was wondering if its a mating thing. Is there a way to tell the sex? I'd feel really bad if they are all males and being aggressive because there are no females. Any suggestions on how to calm the activity if it is due to mating? Thanks!