i had my silvers in a 55g and always had it bare bottom. cleaning was really easy as stated above. Don't know if this is true, but i've heard that a reflective bare bottom can cause the aro to get droop eyes. Like i said, i don't know if it's true, but my aros did develop droop eyes, but i don't know if it was because of the bare bottom. i still keep my jar in the 55g and keep it bare but i put marine sand on the bottom of my 150g. either way, it's your choice. good luck on your new tank