Hi,
the air pump makes noise by the drip ring holes, it's normal, waterfarm makes noise. The problem is that the water won't go to the little roots because of the distance. You have to put a leaning plane under one part of the dripping ring to the little plant for approx 2 weeks and after it's OK with the normal system. Or you can water yourself for 2 weeks, or put a dripper with water pump. The idea is to help the root system to grow without the definitive ring.
OK ?
Fhydro