RQS - First grow! Indoor/Coco/Canna/Auto

Hey there! This is my first ever grow and I'm super excited to get going. Any input is welcome and appreciated :) I'll be growing Green Gelato Automatic by Royal Queen Seeds in Ecothrive Coco Lite, using CANNA nutrients. I have made my own self draining saucers for watering and collecting run off. The nutrient values that I write here are at full strength to achieve the correct NER. I then dilute with low EC water to my target EC, also ensuring the Ph is in the correct range (5.5-6.5). --- Firstly, to germinate the seeds, I put them in a glass of deionized water. I then put the glass on top of my water heater (as its a nice warm space) for 12 hours and covered it with a towel. I then transferred the seeds, without touching them, into individual paper towels that were damp but not soaked. The paper towels were folded over each seed and placed in a sealed container, on top of my water heater. I checked on them every 12 hours until the tap roots had reached a good size. After 48hrs, 3 out of 4 seeds had a good size emerging tap root and were ready to pot. The 4th seed failed to germinate, but the good people at RQS were kind enough to send me a replacement. As they are autos, from my research, I decided to plant the seeds straight into their final pots to avoid the shock of transplanting later. From further research, I have learned that if you are careful with transplanting autos, you won't have any problems, and it can be a lot more beneficial for root development for them to be started in smaller pots and transplanted, like you would a photoperiod (www.cocoforcannabis.com). Good information to learn, but either way, I started my seeds in their final pots of 15L. After roughly 36hrs, they had all popped their heads above the soil and 24hrs after that, had shed their casing, the cotyledons had opened and they were officially seedlings. They started off as healthy looking seedlings, but in this first week I ran into a couple of problems. To fertigate, I mixed 5ml of CalMag and 20ml of Rhizotonic into a gallon of bottled spring water. I started with a low EC of around 0.4. I watered with that for a few days and then started to include a low EC feed of calmag, coco A+B, rhizotonic and cannazym. The first problem I encountered was that after the first couple of days, my EC meter stopped working, and it took over a week to replace, so I was guessing the EC from estimates taken previously. My seedlings then froze. They did not look sick, but they were not growing at all. I was watering with what I assumed to be a very light nutrient water, watering until 20% run off every time, temps, ventilation, lights etc were good but even after 5 days, there was no growth at all on the seedlings. They then started showing signs of nutrient lock out. Finally my new EC meter arrived, and when I tested the run off EC it was around 1.4 which was obviously the problem, was too much salt in the medium. Even though I was estimating, the input EC definitely would not have been over 1, which makes me think that the buffered coco lite may not have been rinsed properly, leaving a high EC in the coco from the buffering. I learned that I should have rinsed and checked the EC of the coco before planting the seedlings, even though it was labeled 'ready to plant'. It was a good lesson to learn. Around day 7, I flushed the seedlings with PH balanced water, until the run off EC reading was around 0.5. I then fertigated with a feed of EC 0.4 which I plan to increase slightly each day as to not have too much shift in the root zone PH and NER. It took them a few days to recover from the shock, and may have stunted them slightly, but after a few days, they are now slowly growing! They may just be a few days behind, or not get as big as they could have but we shall see.. I have faith! I do not have many pictures of this initial period as I was frustrated trying to figure out why they weren't growing, and there was not much to photograph haha! So, at this point (end of week one) they are just 3 small seedlings looking out of place in their big 15L pots. But - hopefully now have a nice balanced coco to grow in and can thrive once they recover from the initial high EC and shock from the flush etc. I will update from week two with proper pictures and more consistent details. I have learned some good stuff so far and am (hopefully) back on track! :)