Question about the blessed seedlings

When is the right time to transplant a seedling into the main medium you are going to use for vegetative growth? I am doing DWC and my seedlings are green and healthy but no longer growing. There are some roots showing but not many at all. How much longer should I nurse them in the small rockwool before I either give up on them or transplant them into the main growth medium?
 
RGords92, I think I am just going to do that. They are not going to grow anymore now as it is. They grew like weeds after germination but then they just stopped.
 
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