You should check everyday at the same time..

after your first grow, you can determine if this is necessary

cheers
Garden Knowm Reviewed by Garden Knowm on . 1st time hydro grow and I have Qs! Hey all, I am planning my first hydroponics grow and I have a few questions. 1) I read a thread where someone said they didn't check the pH for 2 days and their plants are dying... Do I really have to check the pH that often? How often should I check it? 2) I also heard/read it is best to use flourescents for the first one & 1/2 weeks, then switch to Metal Halide for vegetation, then to HPS for the flowering. Is this a good idea? Should I run my flourescents throughout the entire grow? Rating: 5