office aquariums
are you planning on selling them the tanks and fish and then maintaining them or renting the systems and fish to them?
two very different ideas. i personaly would go with system and fish rental because it would lower a businesses intial cost of having an aquarium and also create a higher and more stable income.
i beleive that many people would be turned off from having a great and big aquarium if it cost them thousands up front and then maintenance on top of that rather than a couple hundred a month.
you could offer rotating stocking if you owned the fish. so a office could have a set of fish for a couple of months and then pic out a different stocking list for the next couple months.
(not that i have ever thought of opening my own business)