The gravel in the 75 is some standard bright blue aquarium gravel. I am going to use river rock and pea gravel in this tank. I might get a few long fin black skirt tetras and add them. I have about 10 small java ferns to put it from the 75 g tank. I used black skirt tetras to cycle the 75 from new and they did OK so I might try some with this setup.