Hello chopficaro,
Obviously I'm not there to feel the roots myself so I can't tell if they feel firm or mushy and/or slimy. Nor can I see the top of the plants to see if they look healthy or not. But I don't see anything in the picture that appears abnormal. One thing I do notice is that it doesn't look like a NFT system. The water level in the channel looks like it's more than 1/8-1/4 inch deep. In fact it looks like the roots are floating in water completely submerged. That makes it a water culture system. If you have water flowing through the channel 24/7, that would make it a recirculating water culture system. I'll be waiting to hear the answers to my questions.
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