I don't think you should go into debt for fish. I'm sorry but I think that it's unwise. The 90 gallon won't be big enough either eventually, why spend the money? It will end up being a big cost to you besides the amounts of food they will need as they grow. I wish you would reconsider rather than saddling yourself with this burden you don't need at this point in your life. The amounts of water conditioner, food, filter supplies, new bulbs as they burn out, etc etc etc gets VERY expensive. It's not a one time cost. I really wish you would reconsider that option.