For the inside back wall of the tank I covered in black 100% silicone and I made this background by carving Styrofoam into the perfect size so I could tightly wedge it in there but still remove it when needed. I then covered it with permastone, painted it with non toxic acrylic paint and sealed the entire thing with clear 100% silicone. I also left a are big enough for my arm to fit down to I can take out the pump. I have a running water fall and fogger along with 1 usb computer fan. SO far everything has been good just need to fill it with frogs!