My very first grow

I will update how much I fed the plants later. This week was grazy, one plant grew a lot, the other is somehow blocked... This week started well, Plant 1 nearly doubled in size in one week. I turned the lights a bit higher, but the plants did not like it so much. One night I messed up with the exhaust fan, and for 5 hours the plants were staying under 32 degrees. Plant 2 that was not gorwing much leaped within this time. But later I read that this is normal for cannabis plants, and that is not really healthy.