[sphelps]

From a business point of view a saltwater only store makes little sense to begin with. Out of every person involved in the aquarium hobby what percentage of people are doing saltwater, at most it would be like 10% so by going salt only you're loosing 90% of the market right off the bat. Then if you were to setup something home based out of the city you're targeting a very small crowd of people in the hobby, basically just people you know. You're not going to get the new people like you would with a store front in the city so you're again loosing more potential market.

With that said I would agree that you won't have anywhere near enough demand, basically your customers would be mostly from this site and most those people are perfectly comfortable ordering online so your customer base is already flooded with competition.

Basically if you do go ahead with such an operation make sure you're not doing it for the typical purpose of a business, it would be an expansion on your hobby at best.