I had the same problem a few weeks ago. Funniest part was that when I went to get more where I got the first two about a year ago, the fish room employee didnt know what I was talking about when I asked for otos. Tried 3 other stores (all said they hadn't had any for quite some time). I finally went to a different PetSmart then I usually go to and bought four of the five they had in. I now have five of them total and really like them. Does anyone know their lifespan? One of my orignal 2 is about one year old so far.