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Green Rockwool Cubes

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does anyone know why rockwool cubes turn green when they are wet and have been placed in light? my bet would be an algea or fungal growth but none the less, it looks bad and cannot be really that great for plants :thumbdown


also, once its set in, is there any way to stop it growing or even better, kill it off? and if u keep the cubes out of light, will the green shit still appear :o ???


i have seen many clones with that kind of shitty looking cubes and dont want to take my cuttings and have that happen to them is all...

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