First Grow - Point out my faults plz :)

Day 22 - Signs of preflowering appearing on DD and just appeared on CC! My pH is being brought down to 5.6-5.8 each watering, the brown spots on DD have stopped forming and on CC they’ve nearly stopped. SAH (middle one) is still a lil cripple, but I’m praying I’ve fixed the issue I’ve been having and she’s grown quite a bit in the last week regardless! Starting to get a decent smell in grow room too. - Cut a couple dead leaves off of CC at the bottom which hopefully will help. Tried LST so I’ve got direct light on the bud sites, will try bend the plants more over the coming days. Will wait for recovery of SAH before attempting anything else - Got very tight nodes on each plant so assuming that means my light distance is on point 🤞 - Upped the bloom nutes to be inline with Nebula Haze nute schedule and since a couple are preflowering they could use the extra PK Day 23 - LST recovery looking good. SAH still getting brown spots and slowed growth. Starting a 20/4 light cycle today in the hope that the darkness gives them all time to rest. This is the last shot I can take. Water is pH and calibrated and runoff is close to inflow. Literally nothing else I can do I’ve mini flushed all the plants and SAH still a lil cripple - Brought light down 2 inches to continually allow 40 moles of light Day 24 - Continued LST on all plants. DD looking good! Tested runoff yesterday, been watering daily with nutes solution, and found runoff had fallen to 5.2 🤷‍♂️ So gave each of the plants a full flush and will now leaves the training for a couple days to ensure full recovery. Gave nutes after flush (using coco coir). Runoff was testing at 5.8 once flushed. Will start a flush every week or so I think to minimise the build up of salts. Thought watering thoroughly each day would have been enough but maybe not - Got a new pH pen. It doesn’t match the value my old one shows even after calibration. Maybe I’ve been using a dodgy pen hence my plant problems 😢 Day 25 - Ordered a TDS meter. VERY last think I can possibly do 😂 will update on that aspect mid next week! - Realised when I changed nutrients last week I’ve developed a nitrogen toxicity. Dark green tips and “the claw”. Glad I noticed this one fairly early. Found a GHE nute schedule so I’ll be keeping to that. It’s one with proper values not overestimated ones. Correct ratios etc is what I’m mainly after. - DD and CC have started preflowering which I didn’t think of as the official flowering stage yet so they must have started using less nitrogen. SAH is not in preflowering so the nutes I was giving her before were according to the schedule so I’m going back to that for this one seen and reducing them slightly as she’s fairly slow growing. So applying proper schedule for stage of growth for the other two and hoping they will pick up growth in the coming days with happier leaves! Day 26 - Just watered DD and CC with a 4,1,5 mix of micro gro and bloom. Keeping to the GHE feeding schedule on their website. Put 1.6ml per litre of calmag in each too hoping to give them a boost. Will water SAH with a calmag only mix soon - Pistols on DD are getting bigger and beginning of proper bud formation on the main stem 😍 and CC is slightly further behind. SAH has no preflowering signs yet so I’m hoping there’s time to fix this pain in the ass issue without severely affecting yield 🤞 - LST on DD has worked out brilliantly so far, the other two are just smaller for now but with the adjustments I’m making over the next few days I’m sure they’ll pull through Day 27 - Bit too early to tell but I think I’ve sorted the N issue. Reduced nutes now appear to have helped as the leaves are not clawing like they were yesterday but will keep a close eye out - TDS pen will arrive over next couple days so can properly track that soon - Brwon spots appear to have stopped forming?? They stopped on CC and DD but SAH is still stunted I think. Nitrogen toxicity probably caused that - DD has EXPLODED this week. LST went down very well! Day 28 - Got a tdm meter and the nute mix I’m giving DD and CC is 650 ppm which is acceptable for early bloom. SAH has a ppm of 725 which is in the acceptable range for late growth with a runoff of around 825. Hopefully I can fully monitor my plants now and get SAH and CC back in check! - Runoff ppm is 50 - 100 more than I put on each plant, pH is around 5.5 so will have to flush soon. Will use a calmag only mix I think to hopefully buffer the coco a bit - New growth is looking much healthier than a few days ago. SAH and CC are still stunted I think but DD has an incredible resistance to my newbie skills!