FastBuds Pineapple Express & Friends

This is my second season, I'm determined that I wasn't going to make the same mistakes from my first. Luckily my mistakes were so profoundly stupid how could I possibly make the same mistakes again right?... 1st correction was simple? PLANNING in the first place. 2nd correction was, when. My 1st season was a frothy frenzied, knee jerk reaction to finding out growing weed is decriminalised here?! In hindsight though maybe planting in the middle of June wasn't a great idea so, my 2nd season I decided on April; cooler than the 28-30+° and 80% rh of June, April's ideal for growing weed here. 3rd correction was the medium. My previous seasons choice was to grab any old soil from the local chino which turned out to not be the smartest move?! 4th was for the love of god, PH balance my water properly and make sure when using nutrients I PH balance after adding as the nutrients naturally throws it off. All seeds popped 7 days after planting. All seedlings seem happy and healthy however, one of the Purple Lemonade's on the small side and not making as much progress as her sister. She's got a red stem, that may show signs of stress however, her sister has a red stem and is fine so I concluded it must be genetics... unless both are struggling?! Both Pineapple Expresses are looking fine'n'dandy. Contiuning to water slighty. I've been doing 2 small waters a day as the light-mix dries up quick.