I agree with Katchan about the light effects on the fish for future referrence. In order to help answer your question for the plants I need a bit more information though.
1. What types of plants do you have in the tank and how many of each? (common plant names are fine)
2. What kind of lighting are you using? (flourescent, halide, etc. and the wattage of each bulb and number of bulbs)
3. How far are you through your cycle?
4. What size is the tank?
5. Kind of filtration?
6. Are you using an Airstone? (which isn't necessarily needed in a planted tank and many suggest not using one)
I know it's a lot of questions, but it really does make a difference when it comes to the lighting time and amount needed for a planted tank.