My stepmom have me her old 10 gallon tank with a glass top. It had gravel, slate and white river rocks. I tore down one of my 5.5 gallon tanks and dumped the gravel from that into the new(old) 10 , swapped over the filter, light and heater and the plants and wood. I am dividing it and ordered a black divider so the bettas don’t see each other. Going to order a background for it shortly.