deficiencies? mag/cal, N, P?

Rusty-purplish borders, P deficiency is my guess, check the ph at drainage and adjust the amount of fertilicers.

Yellowing from bottom to top is nitrogen deficiency. If in flowering do not overload it. Nitrogen will hinder bud development. Add a little more then current amount. It's OK to be riging the line on nitrogen deficiency in flowering. I prefer it honesty. The plants generally want a lot of phosphorus and potassium for bud development. Good luck and happy growing 🌱

Also I just though about another thing on the safe side which is if they are auto flowers it could be the plants age that is affected by the temperatures you are growing in. This analysis could be way off but something to look at.

That looks like ph lock out. If it was a cal mag or nitrogen def problem, the veins on the leafs would also be yellow and look vivid but the yellowing with the brown edges means your ladies are taking in a few nutrients but missing a lot of micros. Find out if your strain is more acidic or opposite. If there acidic leave ph at 6.1/6.6 if they are more alkaline level leave ph at 6.3/6.8 it’ll fix itself if you skip two feeds and start back with half of the recommended. Good luck With them. other than the older bottoms, she’s still doing okay it looks like.

It definitely appears to be a deficiency. I think your diagnosis is correct, looks like Cal-mag, and phos. deficiency at a minimum. Maybe try hitting her with a half-strength feeding and watch from there. The leaves already affected won't recover, but the deficiency should stop spreading.