Indoor 400 Hps soil grow with 3 auto Blueberry and 3 auto Snowstorm #2.

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I'm a Canadian with experience in large scale commercial grows back in Canada. Now that I'm in Europe I have to go small and this is my first run with auto fem beans.
I'm on day 21 using a Secret Jardin 120x60x160cm, a dimmable digital 400w HPS ballast, a 125mm Carbon Filter (240m3/h) with a single extraction fan (220m3/h).
Soil is Plagron Grow mix with a pH of 5,8. I started the beans in moist paper towels between two plates. They all sprouted within 24 hours. Placing them in 200ml plastic cups and they all popped up to about 2cm in 2-3 days, after a week in the cups I transplanted them into 6.5 liter square pots.
The water is hard in this region and out of the tap pH of 8. I run it through a Brita filter and it drops the pH to 6ish. I raise it to 6.5 with a splash of unfiltered tap water. I'm running simple on this grow with the nutes and am using GHE Flora-Duo for Hard water.
My light cycle from the get go has been and will stay 20 hours on/4 hours off at a height of 52cm away from the top of the plants. For the first 2 weeks I've had the ballast running at 50% efficiency. Switching to %75 efficiency at the start of the third week. My temps have been ranging from 25 -30 C with it dropping down to no less than 21 C during darkness.
Usually, I start all my set ups with beans but this is my first experience with auto flower and feminized beans. After reading this sites forum over the last week I have discovered that I have been treating the plants as I would any normal beans and have made a few mistakes. I noticed that one of the Snowstorms had some upward curling on the 3rd node set of leaves, I figured I had lock out with the nutes because I started nutes after the first week. All the other plants looked good and bushy with no signs of stress or lock out. Also one of the Snowstorms has grown way faster than all the other plants and so I have been LST it and might have stressed it as I've read that autos don't like being manipulated, although it shows no sign of it yet. As for the nutes, I will still be adding them but at half the suggested amount.
All plants sexed female after 2 1/2 weeks and I'm grinning about that. Although I've notice a single ball or preflower at the 4th node of a Blueberry that has me a bit concerned. I'll include a pic of it and hopefully you other members can give me your thoughts on it because if she is a hermi... I'll cut her down.
So here is a few shots of the plants at 1 1/2 weeks.

Attachment 186617Attachment 186618
And a few shots of them today with the LST one.
Attachment 186619Attachment 186620
And also the ball / preflower I noticed on the Blueberry.
Attachment 186621
Anyways, That's about it for today. I'd appreciate any comments and suggestions from you all. Peace out.:peace:
 
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I've moved this post to the New Growers Forum for lack of comments in regards to the ball / preflower. :idea:
 
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