What's the best filter media for my fish pond and waterfall?
I've used Spring Flo Bio Ribbon but am thinking about Bio balls. Do they go in the tank with my pump?
I would use lava rock in a bag. It's cheap and works great. I put them in an old panty hose leg and tie it closed. Make it so the pump draws water through it or water is pumped through it and then over the waterfall.