molds during germination

A tiny baby plant is a delicate thing, the last thing it needs is to be sprayed with anything. Give it a chance to establish itself and grow a bit more before worrying about little things. A baby plant can have a few "funny" leaves at first, until it gets going and will usually sort themselves out by the third week or so. You have a tiny, living organic being, a being that will not have 100% perfect leaves 100% of the time. As The 8thChevron said, it is most likely residue left over once water evaporates from the leaves, leaving behind previously dissolved mineral salts in the water. You need to water the soil to make sure it is damp from top to bottom, watering with a sprayer or syringe is pretty much useless as it does not provide enough water to penetrate even a few millimetres of soil. For an idea of how big a baby plants roots can become rather quickly, take a look at some pictures in my "Holy Mackerel" diary of a baby plant that has had its roots exposed. This may give you an idea into how much to water and why it is necessary for deep watering, even for baby plants. It is far better to deep water once in a while than it is to water little amounts often. A plants roots need moist soil to grow and search for food, any dry patches will delay/stop root growth and potentially stunt growth. Also, at this age/size, plants do not require much/any feeding for the first 2 weeks or so, so try and resist temptation into trying to force growth by feeding too much and too often. For the first 4-6 weeks or so, quarter strength will usually be more than enough. Once your plant is 8-14 inches tall can feeding be increased slightly. With feeding, it is better to give weak doses often rather than big doses all at once. By this I mean, rather than give full strength feeds every 10 days or so, it is better to give quarter strength every 5 days or so. On top of this, it is much, much easier to correct a slight underfeeding than it is to rescue a plant that has been over fed. All in all, I wish you and your friend well, growing cannabis is a wonderful hobby and a very rewarding hobby too. You will both never stop learning. I have been doing it for 35+ years and still learn something every time I grow! Experience will teach you what not to do, but to know what to do is always open to improvement and experimentation. It will become a lifelong skill and there will be hiccups along the way, but this is how we learn what not to do! Good luck and happy growing,..... Organoman.