Excel should work better than CO2 in such a small tank. Excel provides organic carbon which is exactly what CO2 will provide.
Hm... but even if the plants grow out won't the middle of your tank still be bare? Hope the anubias you're getting is nice and tall then :P
Kewl, so my carpet idea might work after all!
Hoping to fill the middle area with some medium sized plants, not sure what species (open for suggestions
), but ones that will make the transition from short to tall plants less drastic.