OK, I've been spot treating the fissidens with no slaughter yet. But as I was reading up, I saw that people say to use up to 3/ml per gallon! I've been spot treating only a bit more than 1ml in the whole 20G tank. How much should I be spot treating?
My Golden Rule of planted tanks: WWTAD-
"What would Takashi Amano do?"
RAOK Club #69