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[Pisces23]

So I recently finished 3 years of teaching at a great private school and as a going away gift my colleagues in the science department got me a great gift certificate to one of the local reef stores. I've been patient about spending it because I just had to move my entire set up this past week. Things went well and now that things are settling down I'm already thinking about setting up a quarantine tank and doing some research on what to spend my gift certificate on.
As I hope you can see in my profile below, I have a 20 high tank that's been up for over a year now. I added a 10 gallon sump/fuge late this past winter and I've been real pleased with how the how system is running. My 3 fish (a royal gramma, a maroon clown and a 6-line wrasse) each have their own li'l niches in the tank and are cohabiting well. I'm considering adding one last fish, one that would hang out on the substrate. Any nano-flavored bottom-dwellers you'd recommend?
I'd also like to add some more colorful corals to the tank. Everything I have now, with the exception of my temperamental green star polyps tends to be of the orange-pink color variety. I know that this is partly to do with my lighting, but I was wondering if anyone had any suggestions of corals that would do well in a small tank with fairly basic lighting AND would add some color to my wee ocean world.
Thanks muchly!