potential "hole in the head disease" with my opaline gourami?
i just posted something about an angelfish with some redness around a pectoral fin, and now i noticed something's up with my opaline gourami.
a few moments ago i fed the fish some frozen krill only to see a sort of white indentation/spot on around the head of my opaline gourami.
is this a wound (a mated pair of angelfish are about to spawn, so they're getting really aggressive. he also tends to freak out at times and slams against various objects in the aquarium) or is it hole in the head disease?
if it is hole in the head disease, how do i treat it? should i treat the entire tank, since cichlids (angels and discus in this case) are also prone to it?