Purple stem and leaf tomatoes

[Veggrower123]

I've been growing tomato seedling under lights. The underside of the leaf is purple and the stem is purple. I'm using coco coir and some worm castings. Temperature range is 20c -25c.they just have there seeding leaves

[veggiechicken]

Are they purple when you bring them out into daylight? In other words, is it the light which is making them look purple?

[Veggrower123]

Are they purple when you bring them out into daylight? In other words, is it the light which is making them look purple?

I'm using t5 Cfl grow light 6600 lumens. These particular ones haven't seen the sun

[veggiechicken]

Can you pull them out into daylight and check their colour?

[Veggrower123]

Can you pull them out into daylight and check their colour?

http://i.imgur.com/zT1vimP.jpg This is the seedlings

[veggiechicken]

Tomato leaves often look purple underneath - they also turn purple when cold.
I wouldn't worry about yours - they're still babies. Wait until they have their true leaves.