trusses

[Rus]

in response to your original question it's not out of the questions but there are many factors to consider , tank size and weight , how many joist [ not trusses ] that you sit on , [ depending on the joist layout unless you were 14 to 16"out from the wall chances are you are only on one joist , in which case you should at least double or tripple it up , depending on the span of the joist and the joist material as well .

let us know the joist size [ 2x10 / tji / or other ] and span,and how many you rest on [ 1 or 2 ] and that will give us a better idea


hth -Russ