Aquarium Maintenance Service business. Take care of fish and other creatures with an aquarium maintenance service. Business Overview 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...