Yellow Burned Bud Leaves. Purple Calyxes. Red Stigmas. Stunted?

Ph should be 6.2-6.3. Magnesium deficiency is enhanced by led lights—- up the cal mag.

The calmag deficiency shows as yellowing on older leaves, then brown rusty spots on the leaves. My magnum auto has it bad. Gonna harvest in a few days, so I’m not sweating it. 🌱

As for ph, my understanding has become that you stay at 5.8 until flower then rise 6.0 to 6.2, for better PK absorption. Got that from a couple web sites like CocoforCannabis and some other sites. That's why I went up to 6.1.

Thanks for your answers! I have one fan at the top of the tent pointed at the driver of the lamp as suggested for top of tent setup by HLG. I previously had more fans in the tent. Two at bottom and two at top. But I found that in such a small tent, all those fans were drying out my fabric/coco pot, which lead to a massive salt buildup and made the air too humid. Runoff EC was 1000 over input at that point. Started doing weekly flushes. Problems started around then. Around then I went down to only one fan and the exhaust port top of tent. It's only 12 cubic feet (2x2x3). So running my 200CFM fan/filter combo at 50% still means like 7x per minute air replacement. Leaf temp is at 75 or so. So not bad. Can a deficiency of Calcium or something lead to leaf burn?

Hard to pinpoint the issue exactly. But here are my thoughts: I see no fan in the tent- are you running one? Are you supplying some cal/mag? I’ve yet to start my first coco grow ( will be in a month of so) but I’ve been told to keep ph closer to 5.8 It’s possible that a higher ph could cause the some lockout- meaning she is unable to absorb what she needs and the right levels. 🌱 As far as heat stress- it’s possible, but less likely.