Hello, trying to identifying what is going on with my Cardinal tetras. I have had them for almost about a year and suddenly a couple of them started showing signs of what I think to be fungus. I have noticed white looking spots with ulcers on the outside of the fish and maybe 2 out of 30 cardinals in my 75 gallon. Is this a fungus or bacteria infection? Should I treat with 5 days of maracyn + Ich x? Any help is appreciated.
pH = 7.6
Nitrates = 0-5 depending on feeding
Nitrite = 0
Ammonia = 0
Water Temperature 85 deg F