We bought a Royal Gramma and an Emerald Crab. I bought the Royal Gramma because it is simply a beautiful fish. The emerald crab, well it's anything but beautiful. It's green and it's legs are as hairy as a french woman's. I bought the crab because rumor has it that it will eat bubble algae. I have some that hitchhiked into my tank on two pieces of live rock.
The tank seems to be doing great. The snails have eaten most of the non coralline algae off of my live rock and glass. These guys really work hard. Check out this picture of my glass. It is completely covered with snail bites.
The colors of the rock seem to be more vibrant now. I have some desirable looking macro algae mainly growing on one rock. This rock also has a lot of red coralline plate algae growing on it.
The only thing I'm not happy about is my peppermint shrimp. I haven't seen either of them for about a week. I can only assume at this point that they are no more. Edit: My son spotted one of them just as I was typing this. Weird.
I have two worm hitchhikers in this tank that I've seen. One is a small Christmas Tree Worm.
I've read that they are really not recommended for aquariums so we'll see how it does. It is really cool to see how quickly it can retract into its tube. If you want to see how quickly they can retract check out this video on YouTube.
I also have spotted what I think is a Spionid worm. It basically lives in a tube in an empty shell. It literally reels out two sticky antennae, sometimes one at a time, and snags the sand. It then reels the antennae back in and eats whatever plankton it happened to get. The shell eventually fills up with the sand that it reels in. Here is a picture of it. If you look closely you can seen an antenna sticking out of the white tube in the shell.