Amazon plants to me means Echinodorous species, and yes I agree with Damon that doubling your light would be a good start. Also, they are heavy root feeders, so unless you've got your ferts just right you'll need a better substrate than plain gravel or sand. Damon says that if you have a really good fertilizing regimen the plants will absorb all they need from the water, and since he's spent so much time studying aquatic plants I trust his advice. However, if you have a nutritious substrate (I use soil under my gravel to provide nutrient) you won't need ferts at all to grow them.
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