You can see how simple a bubbler setup is. The plant on the left is my hydro from seed (started in a jiffy cube then transfered when 3" tall) and the one on the right I started in soil then transfered to rockwool, then put in hydro, both germinated at the same time. Is it a coincident that my full hydro is so big while my others are so small still? I think no...

Third pic is the rest of my soil plants taken a couple days ago.