last night i had plans so took care of my feedings and went to get ready. when i came back (30 mins) had a mono laying on the bottom. didnt have time to do anything with him so i righted him and he swam alright for 20 mins or so tell i had to leave when a got home a few hours later he was dead. ate fine was acting fine. dont know what happened. he was also the smallest of my monos so who knows but here is a pic or two.