Tomatoe nutrient problems?

[superman]

My tomato plants have been growing for about a month now after having a black thumb for some time i added some more lights and that seemed to fix my problem and my plants have started to take off root growth is now crazy in comparison to before.

However i think i am have a deficiency in some nutrient, but i cant determine what exactly it is. I am using the receipt for success starter kit for nutrients.
After sometime the top leafs seem to develop little yellow dots. Also some of the bottom plants leaves seem to be quit small (i think this is because there is not enough light reaching them).





Any Suggestions would be great.

Thank You