HELP -- Plants looking bad!!!

My plants are turning bright yellow. I thought maybe it was a nute problem, but I don't know. The plants do this whenever they go frol the cfl's for seeding to HPS for veg. Is this a heat problem, nutes or water?

that lil baby shouldn't be getting to many nutes if any. I would guess nutes, whats your PH??

My pH was around 8.5 (I know, but I wasn't testing it) I switched to RO a few days back with 1/2 nutes and 1/2 superthrive. They seem to be recovering, but I don't know. I was giving them 1/4 nutes in the beginning, but the water is so hard here, I though maybe I was getting some bad juju from the minerals. Now I adjust pH to 6.6.

Wow that's really weird. I don't think seedlings need any kind of nutes, just a gentle light and moderate water/temps.

Maybe that's light burn? I heard the leaves go to a "white" like color. Not sure, good luck tho!