Mold found on vegging plant in closet 1 room over from flowering tent, help!

I found some kind of mold on a vegging Super Lemon Haze that was scraggling anyway, in the closet just a room over from my flowering tent, and other vegging plants.

There wasn't good air flow in the closet I put some younger plants into, and only 1 out of the 3 got the mold (so far). The other Super Lemon Haze I have in with it has absolutely no mold on it, and is flourishing like crazy. The first Super Lemon Haze (from seed, Greenhouse) was sickly as hell, had twisted leaves, and was not nice looking, so I scrapped it, and this other one is not doin great either.

Is it pretty probable that I just got a weak, non mold-resistant pheno type because they were from seed? Or am I going to have to worry about my flowering plants getting mold in the room next to it? They are almost 7 weeks into flowering, and are blue dream, those have another 3 weeks I figure. I have very good humidity control (30-50% above canopy, 70% below), and a lot of air flow- lots of fans above, a large rotating tower fan underneath canopy, with 2-high velocity fans blowing up from under the canopy. Its just since I moved 3 plants into my bedroom to allow more room in the other closet, have I noticed mold on a single vegging plant. Its the first time I've ever dealt with mold on a plant before.

As long as I have good airflow, and those humidites above, I shouldn't have to worry about mold at all right? Cause I haven't for the past 10 weeks, and the genetics of the HSO Blue Dream seeds I did seemed to be pretty good and strong.
 
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