Seedlings stretching too much, falling over

How's it going everyone at Rollitup? This is my first post and I'm hoping you guys might be able to give me a couple tips.

I'm a medical grower with 10 patients under my belt and I'm working on my first grow op.

At the moment I have about 50 seedlings in Rockwool on their way, I'm using clonex nutrients mixed with water of aprox 6 PH. I am using a 600W Metal Hallide light for seedling growth.

The seeds have been growing for about a week or so now and some of them are stretching like CRAZY! to the point of 1/3 of all my plants have fallen and are no longer growing upwards.

My light is about 3 feet away from the plants,, is that too far or too close? Or is there some other reason for this to be happening?

I am using paperclips ATM to support the plants but i just want them to stop stretching and start strengthening their stems.

Any help would be highly appreciated, thanks!

replant them. Take the streched ones and put them deeper into the soil about a inch away from the bottom leaves. You could probly bring that light down about 12 to 15 inchs. When they get two sets of leaves you can bring the light down some more test it with your hand if it burns your hand its to close(hold it there for a min or 2) Get a fan moving around (not directly on them).

I would love to replant them hah but I'm not using soil I'm using rockwool cubes,, once they are ready i'm throwing them into my aeroponic system.

Sorry bud cant help you there...I am a soil man. Welcome to RIU.

Damn alright cool thanks man, I figured it was too far but I just wanted to make sure with some other experienced growers before I did anything too hastily..

Well hell yeah thanks for your help!