I'm still in the newbie phase of the aquarium scene, but I've successfully (so far knock on wood) established a 29 freshwater tank for about 5-6 weeks now, doing about 25% water changes once a week. So far I've aquired 5 neon tetras, 1 fancy tail makle guppy, 2 male sword tails, 1 rainbow shark, and I plan on adding 2-3 clown loaches this weekend. I added one live plant about 4 weeks ago, an anubus nana (spelling?) and it seems to be doing really well also. I have a gravel/pebble substrate, with multiple fake plants, a plastic cave and drift wood piece. I've been contemplating adding a couple of inverts to the tank, and I've always been captivated with arthropods. I've started to do some research on various shrimp and other inverts, what would you all suggest that would mesh well with my tank conditions, care knowledge, and existing fish species? I would really like some sort of extra flare to my tank, and I think an invert would be the best way! Let me know what you think!

Set up is as follows...
29 gallons, air stone, tube style carbon mechanical filter, glass heater, overhead flourescent lamp (stock, nothing special).

Thanks for your ideas and suggestions!
-Outi