Before I give you "any ideas you have", I'd like to know what your plans are so far - is this going to be a new building, or adding to an existing building, or perhaps an existing room withing an existing building?

You may want to visit your nearest large public aquarium - this is going to cost ...

I'm building a 40,000 US Gal pond with a monster filtration system, two waterfalls, and an automatic water change system.
Could I put in 1 rtcxtsn, 1 psxrtc, 4 asian arowana, 4 giant gouramis, and 8 oscars? (Please note that the pond has demesnions of 30x20 20x7 of that area is only 4 ft deep and ...