I've started Impatiens indoor. They are still under neon lights as it's not warm enough here yet. They just have to hand in there for another 2 weeks... but right now...

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It started with one plant, now it's two and I've detected it on a third one. I thought they may be short of nutriments, so I added worm castings and a few alfalfa pellets. The alfalfa got really moldy in a day. Irgh.

Different fertilizer? Could it be fungus that is turning the leaves yellow?

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Any help is really appreciated. I was so looking forward to having them out in my wine barrel planters soon.