I have a 50 gal tank about 3 months old w 2 blue gourami males, a few black mollies, black neon tetras and Danios. This weekend I noticed that the dominant male has a reddish spot above his R eye. He is behaving normally and eating fine. What could this be?
Not sure what happened to my follow up post, it looks less red but bigger. He's not holding his dorsal fin up all the way. Also 2nd Gourami has color change on side. Did 1/3 water change 3 times this week, not using any medicine yet.