Carol - there are a LOT of things which you need to do to have a successful 
plant tank.  First of all,   you didn't say anything at all about lighting - 
most aquatic plants need a LOT more light than you can get in a single bulb 
hood.  This light should have a spectrum approximating that of sunlight so 
use bulbs like the Sylvania Design 50.  I would start with a MINIMUM of two 
full length bulbs and see how that works.
Second,  the substrate (gravel).  Most commercial aquarium gravels are MUCH 
too coarse to work in a planted tank.  You need to use either very fine 
gravel or coarse sand.   Sandblasting sand (sometimes sold as Tex Blast) 
works very well.   Seachem makes an even better (clay) based gravel called 
"Flourite" if you can find it.  If you really want terrific plant growth,  
put an inch of cheap "Kitty litter" (the kind with no perfumes, clumping 
agents, etc.) on the bottom of your tank (dry) and put about 2 inches of 
sandblasting sand over it.
Third,  I would put some Malaysian Livebearing snails in your tank since once 
you put down a bottom like I described above,  you will not be able to vaccum 
the bottom.  This species of snail won't hurt live plants but will keep your 
sand clean without you having to siphon clean it.  
Fourth,  I would put some additional fish (like Barbs) and Otocinclus affinis 
catfish in the tank to provide additional fertilizer.   You will NOT need to 
add any other fertilizer (and in fact should not).
Finally, put your lights on a timer with a 12 hour daylight period.
... Don't steal.  The government hates competition.
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