^ if you move to america perhaps.
I'd love to build a big concrete tank/pond like in the links I posted, but in NZ most of the monster fish you can't get hold of so it would nearly be a waste. No peacock bass, no Lates Sp. (perch), no barras, no lower jaw polypterus, no rays, no big catfish, etc etc.
When we buy a house I may consider building something along those lines, but on a smaller scale, and have it set up as either a big south american tank with geophagus, uaru, discus, silver dollars, fancy plecos, various catfish etc, or as just a general monster tank with arowanas, dats, large cichlids, big loaches, polypterus etc. One day...
:lol: