05-14-2011, 10:27 AM
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First, welcome to Tropical Fish Keeping forum. I know I've posted in a couple of your previous threads, but neglected to welcome you. Glad you found us and joined.
Yes, you will need fertilizers. With that much light and CO2, other nutrients will be needed in quantities higher than what the fish will provide. Light and nutrients must be balanced; if any thing is missing, plants cannot photosynthesize. And the more light, the more nutrients needed, otherwise algae will take advantage of the excess light.
The type of fertilizer depends upon the type of plants (species). If you can list the plants you have, I can suggest the best fertilization.