Having acted as a consultant to a couple LFS, I can tell you that their business model ONLY works if there is a sizable maintenance business. An LFS business model in a brick and mortar store simply cannot break even.
Agreed, a business degree is a good plan too, regardless of what people who don't know what they're talking about say.
I had an LFS for a long time, so to the OP, please get that business degree because once you do you'll realize that LFS aren't about profit, it's about doing something you love. You're not going to make much money from having an LFS, very few do, and these days the only fairly profitable ones are online, hyping bland corals, photoshopping, and creating fake "rare" demand. You know, the Sexy Corals/WWC/Cherry Corals business model. Basically, moral choices that most people wouldn't make, and either way there's a lot more money to be made in other industries if you're willing to compromise your ethics. A business degree will teach you that having an LFS is not a great business decision.
You're going to work minimum 60 hour weeks running an LFS, probably closer to 80, and the online market is so saturated with clowns these days that you'll have a hard time getting your name out there. You'll need both an online and physical storefront if you want to make much of an impact, and the entire industry revolves around getting good suppliers and contacts which is another game in and of itself. It takes years to get good connections and even longer to maximize their potential, which is why most shops fail. I know shops with 10+ years out there that still don't have good suppliers.
You're going to have to deal with scammers, a lot, and will come across some of the most despicable people that share the planet with us on a fairly regular basis. Even though I didn't mind the long work weeks, it was the neverending stream of scammers that burned me out in the end.
You can have a chance with an LFS by starting out with arounds $150,000. That will get you a clean decent sized shop, a good website, and enough money to get your name out there. It'll give you enough to buy into the good favor of the best suppliers once (if) you come across them, and you might see a decent return after the first couple of years.