If you love aquariums--the colorful tropical fish darting from side to side, gently waving water plants, and those funky little bubble-activated deep-sea divers--then an aquarium maintenance service is the business for you. You'll clean and maintain the tanks, feed and care for the fish on a routine basis, make additions and replacements as necessary and administer any special medications. You can also set up and stock aquariums for clients who don't already have them up and running, perform tasks like changing filtration systems, replacing plumbing and moving aquariums. And you can set up, stock and maintain ponds as well--water gardens complete with fish are the hottest new trend in residential landscaping. The advantages to this business are that you can start with a minimal investment, part time if you like, and you get all the fun of working with fish every day. If you're a fish person, this a wonderful business, but if you're not a true hobbyist, you won't be happy. Fish, especially those that live in saltwater tanks, can be very difficult to care for. You must have knowledge and experience in dealing with these delicate creatures in addition to a genuine love for them. You'll need to have a real concern for your finny charges' lives and for maintaining them at their optimum.