two tomato problems

[sfambro]

New the forum and have looked at prior posts before I posted this. Here's the questions:
1) Why are by leaves bleached looking (see attached 'chlorosis_maybe.jpg')
2) Why the yellowness around the edges of another plant ( see 'no_idea.jpg')

Here's the facts:

1) Flora gro/bloom/micro mixed as per GH directions
2) TDS 1170 ppm
3) pH ~ 5.9-6.0
4) nutrient temp ~ 22 C
5) Grow area temp ~ 28C lights on, 19 C lights off
6) Co2 ~ 680- 720 ppm
7) There are 7 bush tomato seedlings in the hydroponic grow area
8) 2 X Quad band UFO led lights (180W total) about 18 inches from the canopy, plus 4 T-12 GE plant and aquarium bulbs
9) 5 nutrient feed cycles per day, about 10 minutes nutrient flood time each cyc
10) No sign of pest infestation
11) Lights on 20 hours, off 4 hours
12) Plants have circulation fans

Any ideas?
Thanks

-s