I had 7 ADF's, 16 mollies, 11 tetras, and one algae-eater; all of whom had been getting along great in a 50ish gallon aquarium. Last night, when I got home from work, I checked in on everybody and all were fine. After a two-hour nap, I checked in on them again and was very upset to find one of my froggies floating around (face-down) in the surface current. I was hoping it was one of those froggy things where they appear dead, but are not. No such luck... After poking him lightly several times, and finally scooping him out of the tank, I discovered that his body was rigid. Also, he had what appeared to be an abrasion under his left front arm. I have heard that these cute little guys are not the brightest, and frequently injure themselves, but is it normal that their clumsiness results in death? There was absolutely no indication that anything was wrong two hours prior.