Hi Dan, welcome to the forum! We're glad you decided to join us.
I also love that lo-profile lighting on your tank, very nice. As already stated above water params would be good to know before any fish suggestions are made. At first glance I'm thinking (maybe) your ph might be on the higher end of *normal* (due to the type of rock & sand substrate) so perhaps a cichlid tank? Just a guess, I could be WAY off base.
Once again, welcome to the forum!