Hey Cricket! I just stumbled onto your thread - at the right moment for PICS! ^.^
I love how you set up this tank, it really looks nice. The different colors of sand and the path is super cute - like a little underwater garden - I can just imagine an Apple snail taking a cruise down the middle. . .
Looking at some of those pretty greens in there, I think you might have some plants mixed in that are not true aquatics. I'm not so good at plant ID, but the ones that I recognize are the same ones that I brought home the first time I put plants in my tank - Dracaena sanderiana, is the one that I ended up with I think it was marked with the common name of Dragon plant. There are a lot of variants for sale, some are more green, some less - but I'm pretty sure you have some of these:
*thanks Google for random image*
These are best suited for use in a terrarium setup, they'll live underwater for a few months, but usually will start to die if they don't get time to dry off. Mine went from tank to vase, and finally made it to a pot in my backyard. I think almost all of us have been taken in with this when we first started, and some of us have managed to keep them alive for longer than others, but keep a close eye on them, you'll probably have to replace them sooner rather than later (which is sad, because they look super good in there)
There's a couple other plants that are really pretty, but I don't recognize - do you know what all you have in your setup?
I'm so sorry to be the bearer of bad news! But the tank really does look nice - you did a fantastic job with it! It's just. . . adorable! ^.^