I'd start off getting a true ph meter and getting exact readings. You will need something better than drops for hydro.

Several thoughts....did you pre treat that hydroton? Do these plants have roots extending into the water? You said it was DWC; then said they were clones. They look extremely droopy which could either be from overnute, ph imbalance or perhaps they just aren't getting enough water. I don't have enough info about your system to say.
But I definitely see issues with your plants' health......unhappy ones.

good luck.
Weedhound Reviewed by Weedhound on . macro's 1st DWC!- got a few questions Hello, this is my first grow. Not just DWC but in general. I've done a lot of research and got pretty far thanks to lurking around here a lot. I'm not really sure if the results of this grow are going to turn out very good, this first time is just a learning experience really. I'm growing these 6 clones that are from a cannabis club, they came in fairly crappy condition, looks like some kind of nute deficiency right off the bat. They're doing better than originally though. Technical Rating: 5