Livebearers
So I have 2 females and one male in my 20 g. Params are steady, nitrite 0, nitrate 30, pH 8.4 (I know it's high, but it's consistent), hardness is 300, alkalinity is 240
I know guppies like lower pH but they have been doing fine for months. One of the females had a cottony patch on her tail so I...