As others stated, FFHF is just fine for seedlings. I only use it for germinating and put the seed into soil straight away for germinating. I've had 11/11 success rate with this. 3/3 with peat pellets. I use FFHF in a solo cup (clear), and place that in a red solo cup. I then put a clear solo cup on top of the solo with a solo. Until the girl has started her 3 finger leaves and is a seedling. Pull clear cup out of red cup, and you can see the root growth well on the sides! I use Nature's Living soil concentrate. I never need nutrients now. FFHF takes care of the nutrients for a good 3 to 4 weeks. When I transplant, I either do a super soil layer mix or a living soil mix. No nutrients ever added, and no nutrient burn or deficiency in any of the plants since this method. 3 in wk 5 flower, 2 in wk1 of flower, and 2 in wk 9 of veg. One of the plants was transplanted without nature's living soil concentrate at all. I placed a 16oz top layer of straight living soil concentrate for a top feed on that one. She's started flower, and has never had any deficiencies. That's the only one I'm worried about making it to harvest without issues. I think I will be fine and can add another layer.