I have all digital ballasts, can I just reduce to maybe 600w? I have the top o line stuff so I have all settings really, 400.420.600,620,1000,1040.
I do have a ph pen, I ph (after adding the nutes) to 6.3. as the ph of the runoff seemed to come out to 5.8-5.9 (could have changed now as you say)...