This is my second ever lost and its a hard one. i dont know what happend yet. I have been waiting to switch my imitator to their new viv, because theirs was failing. and i was syphon the water in a corner. the puddle never got deep and the had not problems playing in it in between syphons, every oither day. Today i found one drowned in there. Maybe they were not a pair and one drowned the other.