My plants are suddenly flaccid

Hello . I’m a first time hydro grow and everything’s been going fine until now. I’m set to flip the veg to flower switch tomorrow and a of a sudden my girls are just dropping down when this morning they were lovely. Ph is spot on and temp in the room is 73 and humidity is 41%. I changedbthier nutrients buckets last sunday. Anyone have a suggestion thanks.?

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Are you sure that they aren’t just sleeping…?
Is there a 2 inch air gap between the net basket and water level…?
Are your air stones clogged…?
What are your water temps…?
First things I would look at… :wink::+1:
Pics would help… :grin::+1: