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Quote: SpaceMonkey said: Looks like a water stain.
Thats what I was thinking also. Could be from your water or your nutrients. I collect all my run-off water in a bucket to dump outside, and the bucket has a film of that on the bottom of it.
Not so harmful I suppose, but avoid getting water on your leafs when watering...IIRC, it can act as a magnifying glass for your light and harm your plants Maybe I'm wrong on that, but I always try to avoid it in case. I know I've read it somewhere.
-------------------- Of course it's happening inside your head. Why should that mean it isn't real?
Quote: Pandor said: I'm no expert but I bet it is salts from your tap water. See what everyone else thinks.
-------------------- I am not a cannabis grower. I find the cannabis growers to be the most open to experimenting and sharing out of all of the different botany groups I enjoy. I frequently use the suggestions that I find to apply to own organic gardening and food production.