Hello, I’m a new fish owner and I have a gourami that was doing fine at first but then started to get black around it’s mouth and spotting around the dorsal fin. I have let it go for about 2 weeks just putting stress guard in the tank according to the directions. When I first noticed it it was very prominent and he was acting strange (swimming around in circles really fast) then he started to calm down after a couple days. I had removed my other gourami that was with it from the tank about 2 days prior to this because of “fish herpes” and put it in a 10 gal by its self. Now the red spot on the other is gone and I want to put it back in the tank with the other fish but I don’t want it to get sick if the other fish is already sick. Also I forgot the water parameters have been checked every two days and are really good. What could this be? I know this isn’t the best photo but this is the best I could get as he/she likes to hide.

