One of my Otocinclus died today.
I bought two otos about a week ago and I guess one had a hard time of acclimating. From day one of adding these two, one of them seemed much more active and alert than the other. It seems the active one has made it, even though the activity level has gone way up and the oto can often be found swimming along the glass for long periods of time.
I found the one that passed away on the bottom of the tank quite motionless and with death in its eyes. I reached in with the net to nudge it to move and it didn't do a thing. Poor little guy. I hope the other one acclimates better than the one who passed today.