P330 on a 10g? I'm not even sure a 330 will fit on a 10g. The intake tube will be too long. You would need to rig something up so that the intake would fit in the tank.
330 gph is a lot of current. What kind of fish do you have in there? I think that even danios would get annoyed with that much current. A P120 would be perfect for a 10g.
Still, $21 is a good price for a P330. I would use that as an excuse for a bigger tank.