In posting this thread, I knew it would be a venture where I would not be making money. There are too many variables and too many expenditures that make this a hard business to make money off of. If you are dead set on trying it out, like the others said, make a list of the equipment, price them out, and then make some realistic projections. You'll need a fall back plan as well, in case the business doesn't take off (i.e., where will you get money to sustain your business for the first couple of months where you wont be making money).
I've been pricing things out and by my estimates, will be spending over a thousand dollars for a small scale operation, where my goal is to learn the breeding process first hand. Once I find what works best for me, I can concentrate on perfecting the fish (i.e. spending a whole lot more).