Sure. I lived there up until a year ago on Oahu. There are some local clubs (honolulu aquarium society for one) for freshwater such but doubt you'll find many reefers there as coral possession of any kind is illegal, none of the stores sell them and nowhere ships. Some people do have stuff anyway but not many, and i cettainly wouldnt risk it personally. That said, there is some cool stuff that is legal to take. I had a tidepool tank as well as a very nice planted tank.