dont flush them... its a big mistake i made during years
always wondering why my herb was turning hay
your plants looks nicely fed you should not need to flush
just reduce a bit nutrients on the end but keep feeding them
people talk about flushing because they feed too much/accumulate salts in the medium leading to very high ec .. and they harvest disgusting buds
so to counter this they say to give water at the end
DONT
it kills the taste and all ... and if you do it until your plant get senescent ( yellow) then your meds will be totally fucked
i was a flushing supporter for years .. god forgive me for this