Yellow leaf tips on new growth. Help!!!!

So I have two plants growing in 5 gallon pots in ocean forest soil by foxfarm. They are both under a Mars hydro 2000. I just transplanted them about 10 days ago into there 5 gallons pots. So my question for help is one of my plants just started showing yellow tips on the new growth, my other plant is fine as can be. I have pics below to show you guys. I have fed them twice since being transplanted very lightly. Below is what I have fed them past two time.
Also I am running my light 18/6 temp is always 75-77 lights on and lights off it’s 65-68 humidity is always 55-70%

Florabloom 2.5 ml
Floragrow 5 ml
Floramicro 5 ml to a gallon.

Also forgot to add I had a power outage Monday and my heat and lights went out for awhile maybe 3-5 hours and temp dropped down pretty low maybe around 49-50 would this affect this one plant??