Ahhhh bro....
-Give a good flush of water, 1gal each. The runoff should be sorta clear. Now make a veg mix and water untilyou see runoff again.

in the future:
Plant seed > h20 > h20 > h20 > h20 > h20 > 2nd node > 1/2str feed > h20 > h20 > h20 > h20 > h20 > h20 > slight light greening > full str feed > h20 > full str feed > h20 > full str feed etc...