Yesterday it was beautiful...today its droopy. What happened?

ebb&flow hydroponics
6in rockwool cubes surrounded in clay pebbles

Looks like it's wilting. I bet the 6" cube is pulling it dry and you'll either have to top water it for a while or flood more.

so it doesn't look like overwatered to you...its underwatered?

The top few leaves do look overwatered but that bulging can be misleading especially when they are still small. The bottom leaves look soft/weak (like cloth) meaning it's wilting which usually doesn't happen overnight from overwatering. Root problems or dried out medium can quickly make it droop.

I already get it with the small cubes in coco and even ones that ended up in soil, the cubes dry out before the medium unless the roots can take up enough water. Can you check the roots or feel the cube? If it's overwatered it should be easy to detect.

ok awesome thanks...yeah as soon as I top fed her she immediately looked a little better.