I have just noticed my b/d with two issues 1st the base of its pectoral fin is red thus it's some sort of bacterial infection,how or what to treat it with.The 2nd is it has got some sort of white node on its side just b low it's dorsal fin. The ph is 6.0. Ammonia oppm,nitrate oppm,nitrie oppm.
No other discus in the communal tank has any symptoms.