Yep. Sincerely, the dogs even prefer that little dragon goby over the flashier yellow tang. He'll get bigger than some other gobies at 5-6 inches but he should be fine in your tank. They don't need lots of swimming room. I do feed him twice a day.
Tiki,
If you look in this thread Niko posted some links to help you figure out if you have Cyano or Dinoflagellates. Hope this helps.
Mark