whytewidow
Well-Known Member
Just built my first cob light a few weeks ago. I am just starting to see mg def, but my gallon of calimagic showed up yesterday. I knew I would need it after hearing everyone talk about cobs and mg def. Looks like 2 ml pg is a good place to start.
Yeah any leds cause the plants to eat calmag like crazy. Are you running megacrop too?