Calcium deficiency?

Growing in ebb n flow with sensi bloom and cal mag, 1000ppm using recommended amount of calimagic and 75% sensi. Only affecting my 3 hbss plants, rest of plants in the tray are all thriving.
Have I locked out calcium for these? Do they just need a foliar feeding of the calimagic? Thanks

is this from over-fert possibly?

personally, if it were me and I had three that weren't doing well and the rest were fine, I'd pull the bad ones out. for whatever reason those aren't doing well and if they're all part of the same system there's no point in making changes that would screw up the good ones. They might be hyper sensitive or who knows what... I'd just toss them and forget about them. if they are separate, they could be over ferted but the green doesn't look to dark so it's hard to say right now what's wrong without more info.

fair enough, ill probably let them just run their course and press whatever i get from them! going to try a calmag spray and see what that does for us

This is a very basic chart to get you started.