We had a young fella here in town go into the petshop business. ALmost over night he had a fairly large shop that had just about any legal critter in it that you could imagine........virtually any FW or SW fish, tons of stock, birds, reps, cats and dogs.........He lasted perhaps a year, and soon things started to shrink........ONe day I was around looking for junk (Dedicated dumpster diver is what I am) and low and behold what do I se, but him outside smashing tanks and other stock in a dumpster.....He went bust, and was really disturbed....He actualy tired to go too big too soon and should have started off smaller and expanded as the need arose.........ANyway here about 1 year or so ago while dumpster diving yet again, I found a heap of tanks, and new old stock pets stuff mainly bird and fish and rep stuff outbehind this long empty and closed store. What wsa the best find was 3 of the CPR acrylic nano cubes withbuilt in skimmers etc, that they no longer sell or make.......Evidently someone bought the store and cleaned it out so they cold remodel it, and that stuff was still inside it........
I know I got off topic there, but lots of luck in your new business........its a hard business IMHO to make it in if your not real carefull.