DWC probs...

So I put these in after first set of true leaves (some have said too early). They've been in the pots since 3/8 and i just changed out buckets this AM. for They are growing roots throughout the sides and bottom of the rapid rooter. The Sour blueberry is healthy although starting to get slight coloration on leaf tips. There are 4-5 several inch roots in the water. My Power Africa is pretty haggard but the roots, although small, look healthy (not in water yet tho). Any ideas where to begin?

Sour Blueberry Power Africa

400w MH ~20" above plants, 18/6
tap water pH'd to 5.8, 40 ppm
Air temp 58-71*F
water temp 67*F
added 15ml cal/mag per bucket
added 15ml aqua shield per bucket
AFTER adding those, ppm now 320
small 8" fan blowing 24/7
400cfm fan on every other 15 min
3" net pots, rapid rooters, hydroton
buckets are light tight
40w pump feeding (2) 4" round airstones in each pot

I like to start with water level up a few inches in the hydroton. Roots should be in water, when roots hang down, then only an inch below net pots.

ok i hear you there, but if i raise the water, then the RR would be in the water. its only 3" net pot. RR is maybe 1/2"-3/4" from bottom of net pot. water is 1/2" below bottom (power africa). Sour blue's water level is 1-1 1/2" below net pot.

anyone else? my P.A. looks like its trying!

400W Mh might be a little intense for seedlings that size. I use CFL's for my wee ones.

Good luck