What happen?
Day 14 flower, changed res and defoliated before it she drooped. Then once I noticed changed res again and appeared to be bouncing back yesterday, what does this look like you you guys.
In hydro classic overwatering signs like droop point to O2 levels as well. Is it possible the airstone became disconnected or is getting clogged from tank sediments? Really only other thing I can think of is possibly a humidity spike depressing respiration.
Since it quickly bounces back, I think it's just a mild shock reaction from your res change. Are you using cold or room temp water when you change? If you don't think that's it then maybe it's a ph swing. If it's correcting and not damaging growth I wouldn't stress it.