Aww, those are lovely! The orange one you say is the swordtail? I used to have those when I had my first fish tank (which was a 20g high too hehe, got it as a christmas present). I like the decoration too, but I think it needs a couple of plants. I like tanks that are decorated on a "natural" way (with that type of gravel, not the brightly colored one...) and I like the "sunken city" elements! LOL.. I like to decorate fishtanks that exact same way, only I would put a longer/higher plant somewhere on the back. 8) It's lovely!