I think the first question to ask yourself is: Is this a viable business? Who will your customers be, businesses or private individuals.
What can you realistically charge for your service?
How will you get to the location of the aquarium? Have you factored in your transportation costs.
Are there other companies already doing this? Are they successful? If not, why in your opinion aren't they. How could you do it better and differently?
How will you advertise your business?
As you can see there are many questions that need to be asked before starting any business. If I may, I would like to suggest a book to you. The E-Myth revisited. By Michael Gerber. It is an eye-opener. This isn't to dissuade you from starting a business, it is to help you see the full picture. Good luck.