Yellowing fan leaves at top of plant

OK here's my setup
Home-made cfl light w reflector. (7 blue spectrum 100w equivalent, 2 white spectrum 100w equiv.)
Closet grow.
1 DWC in 18G bucket with mesh pot
1 Ebb & Flow in rubbermaid bins
Both in mesh pots with hydoton
Maintaining 5.5-6ph
Both plants whiteberry from paradise seeds.
Ebb and flow has been topped twice.

My problem is the new fan leaves coming from my topped e&f are becoming yellow on the sides and seem to slowly be moving inwards. The lower leaves seem fine.
My girls are about 5 weeks into veg, and about 12". Waiting until 18" to flower (I have space)
I mentioned my DWC because with the two I am using all the same nutrients, but with the e&f I am using tap water, unlike distilled with the DWC.
The DWC seems to be doing fine so far.
The e&f is due for a water change. but is there something else going on here?
If pics will help I'll gladly post some tomorrow.
I know this seems like a lot of questions at once, I just wanted you guys to know everything I'm doing. Any advise would help.

Long time reader, first time poster
 
Thanks bud...its quite the learning process.
I'm just using shit nutes I bought at wal-mart. Gonna buy proper nutes today and change water
 
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