my first grow

on the 43 day I have again measured to high EC in the runnoff, around 4.0. I have flushed all plants with plain tap water, and will lower the inflow. I think this is why, some of the plants are having a hard time show the sex some plants are beginning to show sex, so far all ladies :-) I did a major LST on all plants, it looks like they already have recovered in one day. My PH meter got submerged so I had to look for a replacement. Amazon was able to deliver within one day so I've upgraded to a Bluelab Guardian Monitor, with external probes. I was having an issue with EC and runoff the past week, and to my horror I actually measured the tap water to an EC on 0.8. that's it! I have ordered an revers osmosis Aqua Medic platinum line plus 24V. I paid 276 euro inc tax and shipping. this is actually a fair price. but until now I will lower my inflow to 1.4 EC. I have also stopped using the BUD explosion, as the supplier schedule only added this in the feeding in week 1 of flowering. It will be added later in the flowering again, around 3 weeks from harvest. My inflow and mix will be in the ratio which the supplier instructed in the feeding table, however I will only mix half the dosages. day 47. I don't think my ladies are big enough, it can be very frustrating not knowing what is wrong. I see examples here on grow that are way bigger, but also grow that are around the same. I've started to look at the lights, perhaps they are not getting enough lights due to the distance and the inline arrangement they are hung. I have lowered them to around 40 cm from the tops, and measured the lux to around 60k-90k with an Iphone app. This will have to do for now and I will observe how they are doing. Someone told me to change my medium to soil less as this is coco. I didn't know other than elsewhere coco is classified as hydroponics..kinda of.. :-) it's change now. Learning new stuff every day. I have decided to add some bud explosion for the next week as well 1ml/l, but I have increased the dosage to 1L per plant 2 times a day Day 47: All FB and SK had an LST today