u/DeadSpreadCheese

I am upsizing my RES’s tank and I saw an UGF while grabbing new filter for the setup. I have a Fluval 70 (it’s a 29 gallon tank), but I wondered if adding an UGF along with it would help to keep the river rocks clean? I am unfamiliar with UGFs as I’ve never had fish and I’ve always been told that the hang on kind of filters are better for turtles. Any and all advice is appreciated!