40 Gallon Weight issues?

The key is making sure it is level. I have a 65 gallon with a 38 gallon sump on my 2nd floor and its fine, mine actually only sits halfway on 1 floor joist and hasnt been a problem for over a year. If possible try to figure out which way your floor joists run and try to sit the tank on at least 2, otherwise you might notice some floor sagging and the tank might worry you a little like mine does.
 
Should not be an issue at all. If you are concerned about it figure out which way your joists run. Place the tank against an outside wall that runs perpendicular to the joists. Those will be your strongest locations.

I have a 72 with a 20g sump between two walls parallel to the joists. This is about the weakest spot and I have no issues.
 
It should be perfectly fine. If it weren't, then Shaquille O'Neal and LeBron James would fall through the floor if they both went upstairs.
 
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