I can't really tell how you are watering from the pic, but, if you are watering the plant roots from the top (drip, spray), keep roots out of the solution....if you are watering from the bottom, the roots must be in the solution.

If you are using a dwc, system, the water needs to be about 1 inch below the bottom of your net pot. The roots will grow into the water. Just make sure you have good air bubbling in your rez.

It also depends on how long the roots are of the plants in the system. If the roots are still within the net pots, then you may want the solution level touching the pots but as the roots grow, you can lower the solution level.

As long as they have a good tap root it will find it's way. I start seeds in jiffy pellets. I take seedlings, after the 2nd set of leaves and put them in my clay pellets and I keep the water little under the net pot. the bubbles will slash on the bottom of the pot and pellets. All you need is clean water and b1 in the water. I use 3.5 gallon buckets with little net pots. 4 each. with a dual outlet air pump. As soon as they start popping roots thru the bottom. when the get around 2" long, then you can put them into the bigger pots and add more pellets around the smaller pot. Double potting. I use this and it works great. No stress to the plants, and less of a pain getting the roots out of the smaller pot.