Newty is constantly running into this first world problem. She's got no room as is and is still popping more beans! Crazy girl. At least she has Swagg to give stuff to. He may never have to run a plant in veg again at the rate she's going. Her partner will kill her at some point when his house looks like a marijuana rainforest from top to bottom.
Too many plants can be detrimental to your grow. If you don't have the space then airflow can be a real problem. Doesn't seem like a big deal but when you're halfway through flower and they are all touching, the chance of mold goes way up. Such a waste to lose plants at 3/4 of the way through the grow. All that time gone. I know you've got multiple rooms so you are fine but maybe for a newer grower that doesn't have 4 rooms to grow in or that much equipment they will think twice about it after reading this. Every new grower gets excited and starts popping beans and cloning. Then it's way too hard to not cut some down because of attachment issues.
Calcium based nutes are perfect for hydro mediums. Because the uptake is so fast there is no chance of calcium or magnesium toxicity at the root zone. You can overdo it with soil though and actually cause problems if you aren't careful. I'm sure most nutrient lines account for this but if I were growing in soil I wouldn't be adding any cal-mag to a calcium based nute line.
Pennywise pretty much got me to start running my PH higher than recommended for my coco a long time ago. I usually am in the 6-6.2 range on PH. If you read the internet it will tell you 5.5-5.8 and lots of people run into cal-mag issues at that PH. I pretty much stay at 6.0 in flower to help with the absorption of phosphorous.
I'll be making a .pdf this year that will be like writing a book on modern, indoor LED growing. Not that I'm really qualified to do so but I just have too much information all over the place in my journals and want to get it all together for new growers. I'm going to start working on that when I get back from my vacation! I'm thinking it will be about 75-100 pages with pictures. I really enjoy doing that kind of stuff and have gotten away from it. Not too many people asking questions or for help anymore so I should have the time to do so now. Most people that were interested in the way I grow have gotten the hang of it and are now showing other people in their threads. Now they are the ones fielding questions so I can just sit back and watch.