moving seedlings to an established system

Hey, I have a question about seedlings, actually not mj but vegetable seedlings. I figure it still applies. I have an already established NFT system running at around 950ppm right now and I have seedlings under lights in various stages of growth, the oldest ones just started getting a very diluted solution 250ppm. Do I just keep slowly bumping up the nutes until they match before i can transplant them?

I dont want to end up killing them after all the time i put in getting them to this point.
I think I'm going to end up having to build some sort of station where they are moved from one section to another, slowly building up the nute level until they are ready to go in the main system.
 
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