Posted: Sat Apr 20, 2013 5:55 am Re: Screen/Cover
If they can reach the top of the tank when standing (just imagine the legs and arms extended) then use a cover, because once they get a hold hold of the ledge anything is possible.
If not, then no worries unless you are afraid of something getting in like another household pet or something.
"I know up on the top you are seeing great sights, but down at the bottom we, too, should have rights"
~ "Yertle the Turtle and Other Stories" by Dr. Seuss ~