Hi there

I have a few questions for you all! I'm growing in a green house. Firstly, my tomatoe seedlings started to appear, is this the point I start feeding tomatoe food or shall I wait?

http://www.pbase.com/akumos/image/93756648
Click for large

Secondly, I am growing cucumbers and cabages in the same seed tray. I then decided to research them and found out that cucumbers like 25C and cabages about 15C. So even though they have started growing, can I seperate then and whats the best way to do this?

Cucumber left / Cabage right
http://www.pbase.com/akumos/image/93756614
Click for large

Thanks in advance!