If you start with a smaller tank it might cost you more money in the long run, but its much cheaper to set up.Learn from my experience (and possibly others)and save some $$. Get the biggest tank you can comfortably afford and fit in your home. Don't make the same mistake that most of us made. Buying a small tank ...getting all the equipment for it, then upgrading within months. Secondly, take it extremely slow. Read up on the nitrogen cycle if you don't already understand it. Like Chief said..read read read! and don't forget to ask questions.