Picture posting is enabled for all :)
we've had lots like this this year, they did improve when we planted them in the soil, thought it was the compost ? not sure though :-\
Its a physiological problem that might have been caused by anything! e.g. Standing in a draught, too wet, too dry, pot bound or a combination of any of these or other things.
Also using tomato feed - maybe too rich???
So my advice is;.......Stop feeding!! ...........and let the plants sulk before giving them water!!
Wow, that is early! When doyou sow them?