They are open for business, but dont know what their hours are. Could be that they have some days that they are not open, as most of the shops have at least 2 days a week where they arent open. Aquatic Art for one, is only open on Fridays and Saturdays, although if you call him ahead of time they often have someone in shop and allow people to come in.
Try messaging them on facebook and ask what their hours are. You can email Thomas too, its listed on there https://www.facebook.com/clownfish303
Just a heads up they have the best prices but they move inventory very quick and with that comes sick fish. Plenty of people who’ve lost all the fish they bought plus more. I was able to keep two clownfish alive but lost all the tangs I bought.