Ive been growing about a year now with no problems. I just switched to a single plant gro from a 3 plant grow, and changed the whole sytem to grow just one big plant. when I swithed to the new sytem I had my pH, oxy, nutrients wrong and we had a heat wave all that combined almost killed her. Now that I figured out my system and have it purring shes starting to get better fast. So as far as yeild I went down to my local hydro store and asked. And was told since im still in veg the my yield and quality will be fine as long as I get her healthy before I flower.