Strange texture of leaves and brown circles

First of all, you're growing autoflowers and autos don't want/don't need any nutes for the first couple of weeks of their lives - and since you started feeding them in week 1, you've massively overfed them. You've now got the problem of a nitrogen toxicity (and perhaps other toxicities as well)... You need to do a proper, FULL flush of these plants which means running 3x the volume of the pot of pH'd water through them which, in your case, means at least 15 gallons of pH'd water. Then let them dry out thoroughly. When they are dry and you start your nutes again, start them at 1/2 strength but anything with a high nitrogen concentration should be at 1/4 strength. You say your Pineapple Express is smaller and growing slowly - she's reacting to all the nutes and in a bad way... for her, I would suggest starting back with the nutes at 1/4 strength - not 1/2 strength... The other reason for your difficulties is the pH level... get that down to 6.2 - when you flush your plants, flush with 6.2 water and test the runoff that you get... keep flushing until the runoff tests 6.2 pH... (it might take more than 15 gallons!) But finally - don't worry about your ladies! They WILL survive this and you CAN get them healthy again. The leaves that are showing those distressing colors won't repair themselves but you shouldn't see the problems spreading to other leaves after a few days... Autoflowers are really sensitive and finicky... if you're following the feed chart your nutes give you, don't. Nute manufacturers don't indicate how much to give autoflowers - they only reference feed for photoperiods ... I've never been able to give my autos more than 1/2 strength of any nute! The exception here is the bloom nutes which are better received by autos than grow nutes.. Good luck... they'll be ok!

This is burning from nitrogen toxicity, as evidenced by the super green leaves. You are either feeding too much or too often (or both), or your soil mix is/was too "hot". This is not a cal/mag issue. Your larger plants will need transplanting soon anyhow, so don't give them any fertilizer for 2-3 weeks after transplanting, there should be enough goodness in the soil to support growth without the need for any additional feeding in this time. Remember too, in soil it should be a schedulr of plain water/plain water/feed/plain water/plain water/feed.......... so that your plants are only being fed every 12 days or so. They need to use what is already there, before new nutrients are added, otherwise nutrient salts build up and cause burning, as is the case with this question.

Hola Aplica calcio y magnesio