The tank I am purchasing comes with no lid and I'm hoping to place my aquarium on a stable shelf with a moderate amount of light. the dimensions of my tank are 12 x 6 x 8 inches. Should I be concerned about not having a lid? Are there lids with LEDs that will fit a tank with my dimensions? Will a betta fish be able to thrive on a shelf with a dimmed amount of light? Thank you in advance for helping this noobie out!