Negative, I just checked this post after reading about changing from GH 3-2-1 to a 1-1-1 and adding calmag.

Calmag is necessary with GH you think?
thanks
squeakerpie Reviewed by squeakerpie on . NEED HELP!!! B A D!!!! - Ebb and Gro - General Hydroponics flora 3 part (using bottle mix specs) - 3 waterings daily (15 mins) - 24 hours of light - RO filter w/20 ppm's after filtering Rating: 5