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I have a 40 with 2 large angels about a dozen giant danios ; it is heavily planted. One angel has white fungus on the lower lip ( white fuzzy about 3 mm in diameter). I have not had any disease in any tank in years, also,no new fish. What is suggested treatment today ? ( I have not medicated in 20+ years). Mythol blue used to be a treatment , but not in a planted tank .