Last night I forgot to close a lid open on one of my tanks. This morning I got up and found my Pantostictus dead on the floor. I look in my tank for closer inspection and I didn't see my Istlanum either. Now I'm panicing looking around on the floor...there he was dead on the side of the tank. How can I be so stupid? I've accidently left it open before and nothing happened but this time I TWO FISH?!!! I'm really bummed out. 