Andy Pierce
Member
Bit of a weird one, but lately I've been having trouble with fungus/mould growing in my EI micro/trace master mix. This is 1 tsp APFUK "chelated trace" dissolved in 500 ml RO/DI water - this stock solution lasts me about 3 months. I tried making up the micro mix with the addition of 2 ml vinegar (5% acidity) per 500 ml and still got fungus/mould, and then I tried it again with 2 ml vinegar and 1/8 tsp (0.3g) potassium sorbate and still got fungus/mould. I keep the master mix at room temperature in subdued lighting but not total darkness, but the mould/fungus doesn't appear green in any event so I suspect light is not a factor. Help! Anyone else have this type of problem and a good solution?