Tomatoes looking bad??

[Waterboy2b98]

My tomatoes all of a sudden are going to hell. I have read a few ideas on here about adding nutirents to my water, but it seems like everyone has a idea on what. Wanted to ask what PH do tomatoes like? Also I included a few pics to ask for what do yall think I need most?
They dont get much direct sunlight, but have a fluorescent light right above it with three different hue tubes. I have a whitefly infestation that I am struggling to get control of. The tomatoes are their favorite snack. But untill last week plants were growing fine and flowering great??