You don't have many options with 40 watts. Java fern, Anubias, and maybe Anacharis would just about it. Cryptocorynes might grow....they wouldn't thrive though. Out of those, only the last 2 would be planted in the substrate.
Since you are spending money on Flourite, you might as well upgrade your lighting so you will have more plant choices. A 108w T5 HO or 130w PC fixture would be good.
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*Kristin*
5 Planted tanks:
55g, 40g, 29g, 10g, 5.5g
10g N. multifasciatus tank, 5.5g Platy fry
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