You have gotten some sound advice. The business end of this hobby is risky. I have a good friend that owns a SW only fish store, and he struggles big time, where he makes his money is by the fact that he is also an importer and sells SW to some of the larger online site, as well as having his own online site, which is out of date because he is so busy he cant update it, nor can he afford to pay someone to manage it. According to him he clears about 200 a month profit from just the store, and he works more hours in a week than some people do in 2 weeks, 96 hour weeks are not uncommon for him.If you truly love this hobby enough to want to work in it my personal advice would be become a biologist of some kind and work for a large zoo or aquarium, the money will be better, the hours will be better and you may even get a nice benefit package. The Avg LFS struggles, and if your planning Fish only or Fish and plants that will be an even bigger Struggle, not to mention a sizable investment to get started i would guess 100,000+. Most LFS arnt really LFS they are pet stores in general.Fish,reptiles,dogs,cats,plants, etc. It is a lot to learn and a lot of work.But if it is really what you want to do apply yourself and Save money, and most of all be ready to work like a dog. no pun intended.