Yes, I immediately closed the gap. It was just a matter of closing it, we just had it open because I left the hose for the mister hanging in the tank most of the time. We weren't careful because we never see them hopping that high. I've never seen them hop even half the tank high, much less as high as the lid and they can't stick to the glass, so, it must have been hard for her to get out. I don't get it. But she is obviously out! And I am very scared she's going to get hurt or that I will not find her in time.