Plant Problem

my plants i started are clones they seemed to be fine in the begining. they are growing in a green house . now the plants are starting to get little spots on the leaves and the bigger they get the more the yellowing spots get untill the whole leaf is like a sunburst yellow . they are not dieing off but the whole plant is this way now any help would be cool . i am a newbie to this whole thing so don't jump all over me thanks .....

here is a picture