Why have the leaves on my tomato plants all gone curly?

I have six tomato plants in my green house. Four of them have got curly leaves but two are OK. All have flowers on and a few small tomatoes. They have all been fed %26amp; watered the same.Why have the leaves on my tomato plants all gone curly?
you need to replant themWhy have the leaves on my tomato plants all gone curly?
i it growing pink? if it is its wilting and prepared to die and you must replant it