He was a horse-face/horsehead loach.
Fastforward to two weeks ago. I started having some problems with my tank and the loach died. I was upset because I hadn't seen any horsehead loaches for sale anywhere in the area and i was pretty attached to the little guy.
Three days after he died, the same petsmart got a shipment of horsehead loaches in as part of their "managers special/opportunity buy" fish. I went to pick out a new loach and i noticed something that wasn't a horsehead loach in the tank.
I got my replacement loach (who isn't nearly as friendly as the old one, but i'm sure he'll come around) and the new unidentified guy... but haven't been able to find any information on what the little guy is.
Hopefully someone here will know... here's some pictures:





