My planted eclipse was one of my fav tanks, and it didn't have a filter either, lol.
I used small crypt species. Parva, Wendtii, maybe a few Willisii, some petite anubias, and baby tears would make for a nice tank. Otherwise, if you add co2, just about any fine leafed plant shoudl do fine. It will just be kind of a pain, having to trim so frequently.
Fish can be a little trickier. Many people will say it's to small for such a space, but I disagree. You shoudl have good luck with a single betta, a sparkling gourami or 2, a spike tailed licorice gourami, a honey gourami, a pygmy gourami, a croaking gourami, a trio of pygmy cories, a dwarf puffer, a small school of neon tetras, or a male guppy or 2. There are quite a few other choices, these are just the ones I could come up with off the top of my head.
The original bulb should probably go, as you don't know how old it is, might have a bit of a pickle finding a replacement tho..
Good luck with it, I woudl love to see pics when you've got it up and running.