Get them, ooops, where's me manners!
Hello m8

Get them outta there!!! Secondly, the drip ring, should be touching the pebbles. Have they rooted through the small rockwool blocks? If so, put them in a propagator, and soak some large blocks in pH 5.5 adjusted water for 24 hours.
Stick the propagator under some fluros, and when the large blocks are ready, transplant, and wait for them to root through. Once you can clearly see roots coming through the large blocks that's when they should be put into your WaterFarm.
Any probs, just shout