Looks like overfert, to me. The newer growth in some of those pics, looks okay, so the overfert might be under control, at least with some of them. Hard to say, man. The best advice I can give you, is to flush them all and start over with a clean medium. Let it dry our til they need watered again, then start feeding, lightly, keeping an eye on the newest growth, as an indicator of health. That'll take a few days to take effect,(up to a week) so be patient.
Also,...what are all those white spots all over the place? Are you sure you don't have thrips, mites, leaf miners, or some kind of pest/s?