I think I have had every problem in the book on my first grow. That being said I stand to harvest about an oz. Let me share some of the issue in my set up.
DWC Res not deep enough the roots ended up covering up and growing around air source limiting air out put.
I used plastic shoe boxes painted black with custom made netty type pots made of yogert cups and as a test an upside down power aid bottle, cheap yes they did work but lacked space for flowering.
my PVC pice air flow design is a joke even with only CCFL and LED run it was HOT in that small space.
CFL bulds my not produce as much heat as and HPS but they can get very hot in small spaces, 85-90' with my crap air flow.
The cheap 30w LED didnt seem to help to much but it cost 30 with shipping.Plants did Veg ok under it tho.
On the FLY modding growroom sucks. Have things right before you crack a bean.
I also belive the root system may have gotton shocked each time I changed the water, fill and drain seems much safer. I hope this helps out some fellow noobs. I'll post final results soon.I may even make a video.