Well, back to the fish subject. Going bigger means getting new lighting, more equipment such as skimmer, reactors, ato, etc. Also, you'll definitely need more flow in your tank, so more powerheads and a bigger return pump. Also, if the tank is drill, you'll need a sump. My point is going bigger is definitely better and you'll be happier in a long run, but there is a lot to think about. Take your time and look around to see if you can find some great deals that comes with most of the equipment you'll need. Good luck with your search and this is the right place to ask questions. BTW, that is not a cat, it's a freaken cheetah!