If you choose to add the other bag, I suggest you slope it from 2.5" in front to 4-5" in back. Keep an eye out for anaerobic spots, though.
Thanks I'm going with a river bank kind of deal we have some rocks from a river in the Smoky Mountain that the kids gather just for the tank so I going to try and a channel in the side I thought about goin down the middle but I think the side will look great. I added the API Quick Start and water from the other tanks. I put in the other bag and will let it settle in overnight I'm going to put the Root-Tabs in, in the morning and some plants.
What are anaerobic spots?