hey tell us a little something bout your grow smoka? like what are you growing in soil or hydro? nutes ph and so forth..
what have you been doing up till now...?
i'd say you've either SUPER nuted those or
your ph is below 4.5
ayup
either way a twenty gallon minimum rinse is in order
move plant into lower light area for a day or 2
cut out all discoloration
feed b12 after rinse