First Grow - Point out my faults plz :)

Day 16 - Brown spots have been observed to get slightly worse over the last day on Cream Caramel, I believe it’s due to the lower leaves dying off like the small round ones are as there is definitely enough CalMag! Watering every 2 days now with 20% runoff, might have been overwatering slightly. Raised pH to 6.2 in case Calcium uptake is blocked. Dark devil is just looking beautiful. Last 4 days have shown serious growth! SAH is looking a bit dull :( but still growing more by the day! I believe it’s leaves were damaged due to the seed being stuck on the seedling for too long and it has struggled since then but it’s 5 bladed leaves are starting to come through so I’m hoping for a boost in the next few days! Additionally, I lowered the light to allow for 40 moles of light to be absorbed per day (the max before CO2 has to be added) so hopefully I can keep the light at this distance for the rest of the growth to allow for optimum lighting! All growing nicely, just praying for greater growth to allow time to LST before flowering!! Day 18 - Upped nutrients to boost nitrogen before preflowering kicks in, I’m expecting it in around 10 days minimum so will start LST training this week especially with DD reaching the pot edge! Day 20 - Believe I may have had an issue with the pH as these brown spots have now appeared on all plants so I’ve flushed them all with pH 5.6 nute solution until each of their runoff came out at 5.8-5.9. PRAYING this solves the problem as I have no idea what else it could be. Originally had ph at 6.0-6.5 consistently more or less so this HAS to be the issue and I found out the optimum pH for coco is 5.8 🤦‍♂️ I’ve sorted it now hopefully, guess we’ll find out over the next week or so if more of my leaves keep dying Looked more into other people’s grow diaries with soilless mediums and it definitely looks like mine was way off! When flushing my pH was coming out way too high initially around 6.6 in DD. Now that I’ve adjusted all of them to a more suitable level they should perk up and I’ll keep close eye on the brown spots over next few days. This may also be the reason for the lack of chlorophyll on the leaves (all the random pale green patches) that have been there for weeks. Plants seem to be growing fairly well regardless but I’m really hoping this stops the spread of spots and boosts growth before so I can train!