Thanks guys. I think that if I mount the 501 under my desk which would be 6'' under the tank I wouldn't have a head pressure or gravity fight. My only worry is a snail going into the intake and blocking the impeller or clogging the line. I will probably hide a sponge behind the rocks and put the intake line in it. I'm not up for investing much in this tank right now. Unless I can trade or sell some of my other used equipment for it.
Jason: I think I found that little desktop betta tank at Petco. There has been a lot of neat little betta tanks that've come out in the last few years that lend themselves to cool little reefs, vivariums, or what ever.
This is my first planted tank and I'm really getting into it.