Well, the point of the matter is not what it can live with minimum, but more keeping the fish happy and healthy, and actually thriving....not just living.
actually there are some people on here with very large tsn, not quite 4' but certainly over 2'. would you mind mentioning what these other sites are? they don't sound very reputable
alright, so you suggest importing the amazon river? to be "truly" happy, healthy and thriving it should be in its native habitat. not even a 1000 gallon pond is as good as its south american ecosystem. just to give you an idea, the amazon dumps 60,000,000 gallons of water per second into the atlantic ocean.