Some are trying to decide if the pet industry is the field or a fish store is the business they want. Others have already decided. For those that have chosen to invest in the fish or pet industry, doing it right involves asking the right questions of the right people. Forums like this are great but the replies are only as good as the headline. If the headline draws in the right people, the ones that have done this before, the ones that have researched the possibilities, the ones that are about to take the plunge, the ones that, if they they do this, want their store to do it right, or a good consumer that can state what they expect from a store they'd chose to business with ... you get good answers to your questions. If you draw people unwilling to discuss the steps, set in their ways, and feeling they KNOW all the answers, you get drivel unworthy of the space taken up for the discussion.
It's tough to compete with the big boys like Walmart, Petco, and PetSmart and unwise to try it head-on. Stocking complements to their selections and not competing directly on products or price would be just good business. Survival of the fittest doesn't always apply perfectly in today's business climate.
A business owner smart enough to select products of quality, priced properly (that doesn't always mean cheap), unwilling to compromise his principles just to satisfy a single customer, deserves to do well. That doesn't mean success is inevitable. It's a day to day thing. I've always encouraged my younger employees, when I was a store owner or manager, to choose a career that would give them the lifestyle they wanted rather than a job they were willing to do the rest of their life. Arriving at retirement age and being unable to retire isn't a good place to be.
A thread like this could also make better consumers from the hobbyists that lurk here. Buying EVERYTHING online isn't very prudent if the store down the street goes belly-up. Spending part of your funds to keep the ones you want to survive alive would be in a hobbyist's own best interest.