i have used Fox Farms Happy Frog but i wasn't impressed so i went back to Coco Coir , perlite, and earthworm castings .for the little one's i use 50/50 perlite, coco. when i transplant go to 15/20/65 earthworm, perlite, coco.
But i do tend to overwater. i use General Organics as my nutes with Recharge and have really good results.