What is causing this?

My young sprouts are 6 days old on the leaves it seems the rim/edge of them is going yellow?

What causes this?

you are going to ahve to provide more info.

soil, nutes, lights, temp, basic grow OP.

low (n)...

If you can't provide a pic, I suggest you figure out the problem yourself by using this: http://www.icmag.com/ic/showthread.php?t=11688 I've always found this useful, hope it'll be useful for you too.

ugzkmk said:

you are going to ahve to provide more info.

soil, nutes, lights, temp, basic grow OP.

Click to expand...

Unfortunately I dont have a camera that will take a detailed enough pic to show.

Nutrients included a 1/6 of suggested solution of some 24-8-16 fertilizer and 1/6 bloodmeal

temperature floats between 19 and 21 degrees celsius

lights are 3 CFL 23w 6500k bulbs currently sitting about 3-4 in from top of plants.