There was a guy on the forum about a year ago that had a good post about tanks.
I'm planning on making a few next year for my garage.

As long as they don't get real deep....they make them out of plywood and cover with epoxy marine paint. Some of the big public places do that.
The design can be pretty much whatever you want and whatever you can pull off ( wood-working ability)
There are different marine paints, so you have to make sure its not toxic, but its cool because you can also drill whatever size holes and fixture you need for filtration and pumps. Now that I'm working on a small backyard pond...I've learned a lot more about pumps and things. I used to think of only pumps and filters designed for aquariums.
Instead , you can buy much larger pumps and build your own filtration.
Thinks of it as building and designing an aquarium filter just like the small store-bought one...just way bigger.
The filter I'm building in my garage will be about 250 gallons when done. And the pumps turns over 2800 gallons an hour.

Anyway...try searching the archives here , and also the general web. We even found a site for walking you through putting glass in the front of the wood tanks to make it like a giant display tank.
Mike

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