First Grow - Mephisto

Plants really starting to take off now with the exception of one. One looks noticeably weaker than the others and is much smaller yet still producing leaves, albeit shriveled looking. I'm not changing what I do since I don't believe I'm over watering and it's at the same distance from the light as the others so I'll wait a bit longer before I do anything. Anyone got any ideas? Oh a couple of the leaves have a slight orange/burning of the tip of the leaf and curling. Starting the Advanced Nutrients trio of Micro, Grow, and Bloom at 1.5 ml mixed into 5 liters H20 that sat for over 48 hours to let the chlorine dissipate. **Starting next week and going forward, I'll post just one full size picture of each plant at the end of the week to show progress instead of every day.** Day 15 (05.21): 1 liter water @ 6.4pH each plant with 1.25 ml CalMg for 5 liters. Day 16 (05.22): Nothing done. Water ring still slightly visible. Day 17 (05.23): 1 liter water @6.5pH each plant. Day 18 (05.24): Nothing done. Water ring still slightly visible. Day 19 (05.25): 1 liter water @6.25pH each plant with 1.25 ml CalMg, 1.5 ml Micro. Grow, & Bloom to 5 liters H20. Day 20 (05.26): Nothing done, soil still moist. Day 21 (05.27): 1 liter water @6.4pH each plant with 3 ml CalMg, 5 ml Micro. Grow, & Bloom to 5 liters H20. *Started LST by tying main branch down. No idea what I'm doing. Miss my pretty upright plant.