Sounds like a well set up saltwater system
3ft tall tank...what is that soemthing like 30-35g (114-133 liters)?
I'd find the sump pumps overkill for a normal planted tank set up you're going for; a normal canister would be sufficient enough. So it may be an option for you to consider seeling the 'salt' equipment and use the cash for the freshwater set up.
Also the powerhead I'd not recommend using in a Planted FW set up; not only because of the plants, but the fish you're listing that you're interested in are naturally found in calm forest streams, they'd def not appreciate the extra power.
The light was necessary for your salt set up, but is a clear overkill for planted tank, with this set up it may well be that you'll literally burn up your plants, and again the fish list you have there is used to very dim light so also there that's not natural. Assuming you have normal florescent tube fixtures, here's 2 things I'd do when exchanging the bulbs, get normal full spectrum bulbs rated around 5-6500 Kelvin (like the light you have over your sump for at night)and whatever your actual tank size is make that about 1 watt per gallon; example on my 55g's I have 2x30 watt full spectrum for fish and plants, works wonderful.
Ok then t he fish: What are your water parameters? Like pH and KH; some of these fish you have listed there will only thrive in soft - acidic waters, so make sure that is what you have before running into the issue of stocking your tank with "Softies" when you have hard water.
I've used playsand in various set ups, works great. Co2 is def not needed; if you have a proper stock of fish in the tanks that'll be all the Co2 you need right there. Also what works well and you may like its looks better nce you comapre at the store: Pool sand. its not quite as fine as playsand and looks more natural and less 'white' - Just have a look at the store; just a thought.
The lights can be easily purchased at any homestore like lowes or homedepot; I have used these lights in years now and they work wonderful (provided you buy the specs mentioned above) you can find these bulbs by Phillips, GE, Bright Effects for example a 2-pack 4ft'ers for my 55g's cost me about $5 at Lowes.
You can gladly check out my tanks on the left here under my screen name click on the tap "Aquarium" and you'll find all my tanks there - All of these are set up w/out Co2, no ferts and the "homestore" lights and I think once you see my plants, its speaks for itself