Hi. this is my first post on this forum and I came here seeking the real truth behind a few question I have. I have been on a few open forums that seem to give horrible info and they are very misguiding. I want to know what a good tank size for a silver arowana is? I currently have a 135 gallon with a 16" silver aro and a 58 gallon with two 4-5" arowana in it. what will be the best size tank to get for these when they reach full adults? to give you an example of the kind of answers I got from this question before was that some people said my 135 was fine for an adult and some said I would need a 400-500 gallon minimum. please fill me in with the correct info.