Hey there idk what stage your plants are in but sometimes right after plants are seedlings and you put them in a larger pot sometimes you may not need to water them for like 14days if you got the soil completely dry. Also if they are in the stage where you are ramping up the light above 200umols that’s when they are getting hardened off and sometimes you have to give them a day of 50% the light intensity so they can recover and they will bounce back especially if they got beat down with to much light and over water