I have had a pink spotted goby, but never a blue one. It was very pretty, but not the best sand sifters like other gobies, ex. The sleeper goby. they can be aggressive towards shrimps so be cautious if you are thinking of adding any shrimps. my opinion, make a list of what you want, sit on it for a couple of days, research all the different inverts, and build the rest of your livestock around that. again, I am very biased to inverts! you have me wanting to go back to an all invert tank again. ending note: if you are interested in a goby: google as many gobies and blennies as you can, and pick the one you like most for your tank, and keep in mind a lot of blennies and gobies will be aggressive to others of their same species. Oh, also make sure you create a "cave" out of your rock work if you get a goby, they tend to be very territorial. Still excited for you and your tank!