plants like all living things need rest to thrive
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you got some twisted leaves too
its hard to tell from the pictures do you have any white on the lower leaves with the yellow?
could be ph
could be copper deficiency if it has white on the lower leaves I cant tell
could be nute burn
That what I was gonna suggest chap
I wouldn't flush your medium, just remove the water in the system and re-fill.
Then wait about 3 days to see how your plants respond.
If you notice yellowing then browning tips on your plants that would be nutrient burn. The twisted leaves appear to be from a pH fluctuation.
nice plants! thanks for the images