help 50 nirvana swiss cheese seedlings ill!!!!

Hi New on here .and hope someone can help me.I have 50 swiss cheese seedlings they sproted two weeks ago .they have just stoped growing and are a very light green colour they only have two leafs and i have grown from seed before and not had this issue my ph is 6.1 in a seedmix soil.Iam sure they have not been over watered and none are wilting.just extremley pale .I sprouted them under some flouresnts and they looked fine then they stoped growing and looked a bit moody.I then placed them under my 1000w mh with no change. Could it be the water it is from the house tap but stored in a but.??Realy confused .I have a couple of butts one with my nuits in for flower and one with tap water .Is it beter to use water straight from the tap and add nuets as requied i have had some issues with clones i was watering going the same colour .Is bottled water a good alternative for young plants as when in flower they seem fine and green untill the later weeks.Should i start and add a nitrogen spray to try get them through .Sorry for the long story hope somone can help cant afford to loose these im skinnnt.

What soil are you growing in? How old are the seedlings? O.K. 2 weeks, any pictures?
I'm guessing they need some food, but need more info, and pictures.

TMB-

COOL what sort of feed i have been told a half dose of fish mix or bio grow nice and high in nitrogen,????iam in cana seed mix i usually stay in this for a few a couple of weeks then switch
to all mix .Iam trying to aquirer a camera as mine is broke .desperate times .

This is what I would do... .
I would take 25%-50% of the seedlings and transplant into a quality soil, like Fox Farms, Bio Bizz, Black Gold, something that has food in it. Then see what happens in a weeks time. If in 7 days no difference, I would have my ph meter checked/calibrated. Also go to the store and buy some distilled water, just a gallon or two, and water ALL the girls with this the same week. Chlorinated water can be very hard on young plants, so I would try these two things, If all the plants respond, it's the water, if the plants that were transplanted are the only ones to change/respond, then it's the soil.
We need 3 things to grow....Soil (food), water and sun/light. Now we have to tweek each one a lil bit to get the girls to react. When they react, then we will start to understand our plants and their needs.
Hope this helps-
TMB

thanks mate ive been pondering on the water now for a while .cause i had the same thing with a shit load of clones not long a go .ive recently got my blue lab combo meter back from them all calibrated.i sent it off thinking it was that and they said it was fine.iam using quality soils so i guess it can only be the water.if i buy bottled water and the ph is below 5 will this matter. Thanks for your help mate .