The Resinrection of a grower

The three other plants are doing fine, the major one has shown this issue witch I have asked a grow question on. The soil pH seems to be under 7, so in foliar sprayed Epsom salt. The leaves that have started yellowing are mostly trashed now bit it seems like the other leaves are remaining green. The other plant has some bad fungus gnats from the rainy outdoor water it was vegged in, but seems to be very string and not much affected.