Root color

[GpsFrontier]

OK, if nutrient temp is not an issue, I would suspect the nutrients themselves.

1. What type of nutrients are you using?
2. Is the system a N.F.T.system?
3. How often do you change the nutrients?
4. Are you using an air pump and air stone to aerate the nutrients?
5. Do you check the pH every day, and what is the pH level?
6. What plants are you growing?
7. How old are the plants?
8. Have you flushed the system with FloraKleen to get rid of the accumulated fertilizer salts?
9. Is there a lot of algae growing in the system?