yellow growth from sprout

i have 3 seedlings and 1 came in all nice and green but 2 that came up yellow and as they grow they get greener but these are some weird ones.. all 3 are in the same soil, nutes "FF grow big", everything, the soil ph is 6.8 they are under t5's. any idea's on what the prob is? they look N deficient but i don't see how since all 3 are under the exact same conditions and 1 is fine .. help!

zinc Def. maybe? try adding some chelated zinc- Im no expert but that looks like it to me.

she hadda be loocked out .. so i PHed 5 gallon of water to 6.0, the soil run off PH was 8.1 when it first began to run out of the bottom of the pot ...and flushed until the run off was 6.4 ... i guess i'll let her go till the soil dries and then resume with feeding and see what happens. very seriously considering setting up a DWC and going from there, hydro seems to be a easier solution. i found out that RO is stripped of all the minerals, so i guess tap water is going to be a better way to go.

^Definitely go with the transplant, it'll work great. That soil is pretty good stuff, having everything your plant needs, ansd will have your deficiency/s fixed, asap.