While you are figuring costs of setting up a 200+ gallon system, don't forget that it will likely cost you a great deal of money to fill it up with livestock. You could easily spend thousands on a tank that size (or two 90s for that matter) before you get it to "wow" factor status.
Do yourself a favor and do loads of research and price out everything you will need to finish the tank before you even start. I have seen more than a few of these large tank projects take it's toll on the hobbyist and the tank never gets completed.
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