Hey dude. Its a little hard to see from those pictures what it is.
But. My standard list is. Flush out the medium with ph natural water and raise the lights a little bit. It may be an unbalance in the roots, or salts but I also think it could be light/heat stress. It will take a couple of days. I was wondering about maybe they could use some nitrogen or calmag. But I see you follow the chart from canna.
Anyways:
Since you have em in soil. This could be fixable đ
That's quite a symptom dude.. I would say environmental or something about feeding... Too have all the plants doo that is quite something.. I don't mean to scare you or anything.. But that looks like it could be some form of pest or infestation, The only reason I'm leaning towards that is that it looks like all the plants have it..