Tips of 2 leaves paler/browie.

I am growing northern lights inside using sunlight. I water in the morning and night. Then the other day i started using ionic grow and now on both plants, the tips of two leaves on the bottom have gone paler/browie. Can anyone help or tell me what's wrong?

Plant 1:
http://tinypic.com/r/r8i9o1/7
http://tinypic.com/r/2d7bk05/7
http://tinypic.com/r/upi13/7

Plant 2:
http://tinypic.com/r/35mhc8i/7
http://tinypic.com/r/slptzq/7
http://tinypic.com/r/2qbbodv/7

your roots are suffocating from the water. the plant is a wick for water, and you need to wait for them to dry out. you should only be watering once a day MAX with those size plants.

Kk, thank you, when i do water should it still be with ionics? and so only once a day?