AeroGraden Drooping Leaves

i recently wanted to try growing, so i started using my aerogarden..
i planted my first forbidden fruit seed 3 weeks ago and everything was going well until i put in nutrients, which i reckon caused a few of the leaves to curl and turn yellow at the tips.

So i flushed out the water which had the nutrients in and added new water. The leaves which had started to curl have become slightly better but some other leaves which are a healthy green colour have started to droop and im not sure what the cause is or if its normal.. Help!

I'm also growing in an aerogarden and have the same problem...a lot of people say drooping is cuased by overwatering, but that doesn't really make sense with a hydroponic system. I tried putting in two side lights in addition to the grow bulbs and that did the trick for about a week...then they continued to droop so I'm stuck just like you.