Added air bubblers to tanks and collars to bending seedlings stabilize stretching. Note1: using powder nutrients, all units are mg/L, not mL/L. Note2: using quarter-strength nutrients for nursery hydro (PowerGrow recommended: .6 mg/L Masterblend, .3 mg/L epsom, .6 mg/L calcium nitrate). At this point, adding Hydroguard at recommended strength (2 mL/Gal or .5mL/L). Each tank is ~2L, so 1 mL per tank.