I'm having to pot my plants early and was thinking of using Happy Frog, mushroom compost and Perlite for the medium, and was wondering if this was enough or if I needed to add anything else. Someone had suggested FoxFarm's Peace of Mind in addition to the Happy Frog, but they might have just been trying to make a sale, but I wasn't sure if I should add kelp or blood meal or something. Also, what ratios would be best? If I just used the three, I was thinking 70% Happy Frog, 20% mushroom compost and 10% Perlite. Any help would be appreciated, thanks.