my leaves are dry and the plant is growing the nodes really close together i already on my 4th node in 2 in of stem, also kind of droopy. Im on 18/6 with ebb and flow. i cut down the waterings from 3 to 2 everyday but not really looking any better, Maybe needs more waterings? anybody?

also they have been in the system for 15 days

when i was flowing i ran my timer 15 minutes every 2 hours when lights on, and had air stones/pumps in my resivor for extra extra oxygen. i had awesome results. make sure your flow system is saturating the rockwool cubes all the way and not just the center.

Welcome to the forum. Curious, What medium are you using? Watering for an ebb and flow using rockwool can be as low as once a day. Clay pellets on the other hand....Pictures might help to answer a lot of questions. VV

hydoton clay pellets im using, with rockwool cubes.

they also sit in square pots in the flood tray without any medium around the pots

I think you better check that watering schedule. Every two hours comes to mind. Check Faq upper left hand corner to be sure. VV