I put a baby 3-4" Aro in my tank this morning. He's missing! THe tank is covered really well so I don't think he was able to jump out. I don't have the back of the stand covered so I was able to look behind the tank and all around. He's not in the sump either. I looked inside the overflow as best as I can. I have a screen on the overflow as well so it'd be a tight fight for him. I have two 5" rays so I don't think they ate him. I have no decorations so he couldn't hide.