Some black dots have appeared on the cheeks of my dwarf golden gourami.He seems to eat less and has a habit of hiding in the plants or moving up and down the tank walls to the water surface or staying motionless at an angle. He looks like he wants to climb vertically up the tank wall. Its a bit creepy to watch him.
Any ideas what the black dots could be? They seem to gradually get darker and more obvious when the light is switched on.None of the neons or the other gourami are showing any signs of the dots yet.Is it rust? or freckles?