Not trying to throw a wrench into your plan, but have you figured what it would cost you to do this? If you are serious about starting your own buisiness you'll need to have some insurance. Every state has an insurance minimum you'll need have. What would happen if you were cleaning a tank and knocked over some rock and broke a tank? How would you prepare the water in advance and transport it? How much would you be spending on supplies? If a fish died after a cleaning (even if it's not your fault) would you replace it? Then you have to factor in federal and state taxes and make sure you put that money aside to pay at the end of the year.
If you are serious about trying something like this try and find a company that maintains tanks and get a job with them first. This way you wouldn't personally be responsible if anything happened.
. What is the worst that could happen? If the tank leaks, it would be the companies fault.
Daniel
I think some of you are making too big a deal of this. He's not looking to maintain the stock at Sea World, he's talking about cleaning up a few of his neighbors' tanks, or a few at some offices. Just give some simple information up front about your obligations and their obligations, who is responsible for what, etc. I don't think it would be nearly as difficult as some of you are making it out to be. Just stay honest and be careful and you should be fine! Best of luck Daniel!