It's a 5 gallon regular rectangle tank, it came with a light(from walmart, so I don't know how good the light is. but the tank is in a fairly sunny room(not in direct sunlight, but there are a lot of windows, and regular plants seem to do well in there)
I would skip the crypt--they are root feeders, so unless you have a few root tabs for it, I'd stick with stem plants and rhizome plants like anubias, bacopa, rotala rotundifolia, christmas moss, java fern. If you want a nice root feeder, dwarf lilies are great for bettas and they're a really beautiful plant with nice broad leaves for the betta to sit on and nest under. The leaves tend to get a little messed up in shipping due to their shape, but once they grow back in--lovely!
Ok, took the crypt out! Think the rest is good for now? I might go back and add more later, at least when I get to see the tank in person and get a feel for how it's doing! I do love the mosses and would enjoy adding them later :)