David, Ok, now I get the SLO method, it’s always helpful to have a visual. I will keep it in mind for another system down the road.

rfeiller, What is the best way to create a current? That sounds like my best option at this point.

Urban Farmer, I am intrigued about adding worms to the gravel at the bottom of the fish tank, but wouldn’t they drown being submersed in water like that?

Thanks for all of the responses!