For us mortals, there are kits. Iron is another nutrient that often needs to be monitored. It is hard to find a kit that will measure this low. It is important that your plants get enough light. Direct sunlight is OK, especially if it is not available for too long a period.
Light pipes are good too.
The consensus seems to be 2 to 4 watts per gallon of cf. One new source of cf lighting seems to be particularly fairly priced, Aquarium Hobby Supply , Give their site a look. I am proud to offer the Tropica Catalog. It offers the most complete list of plants and detailed cultural information at a popular price. Watch this space for future announcements about other books.