mattiej & gasguzzler:
Well said. Although I certainly wasn't suggesting nor would I ever suggest underfeeding an animal (I don't think MorayM was either).
Topaz330:
I've kept Leopards for a number of years with varying results. I don't have a leopard. In fact, I seriously doubt that I will ever purchase one again. They are beautiful animals and they are very tempting, but the fact is that most specimens will not thrive in a home systems. Unless you are able to chill the water and provide a huge sytem, the odds are not in your favor (or the sharks).
Now, I don't think it is our place to tell other board memebers what they can and can't purchase. We should; however, caution you. After all, there is a wealth of knowledge here, so folks should put it to good use. Leopards don't like warm water, tank corners, aggressive tank mates, etc. If you are truly dedicated the providing an adequate home, I think we should support you by giving you the best advice that we can. A chiller, a great skimmer, maybe a UV light, etc. need to be in your budget for the 180. If you have the appropriate equipment, I believe that the 180 should be sufficient for a year to a year and a half. Your 500 gallon tank will make a great display, but you do have to remember that you will not be able to support an adult leopard for life. If you are still interested, I suggest that you start working now to find a potential home for your overgrown shark. Good luck!