Determining floor/joist weight capacity

[sphelps]

Against a load bearing wall and perpendicular to floor joints and you should be fine. is it a 6 foot tank? The more joists you can line up under the tank the better, and avoid using a large sump or plumb it into the basement. You can also attach the stand to the wall for extra support but if the tank is on a softer floor fill the tank first prior to mounting.