The leaves of tomato seedlings are yellowing

The leaves of my tomato seedlings are yellowing. What might cause the problem? How to solve the problem. Can I transplant them now or should I leave them in the pot until they become stronger . Thank you.…

Tomato Seedling Emergency!

Hi. Four weeks ago I planted a number of cherry tomato seeds into small pots an placed them under grow lights. They sprouted one week later and they have been growing nicely ever since. I started with three per pot,…