Can anyone please tell me exactly which species of Otocinclus this is?



I took this after getting them. They've lost this harsh, irritated pink color to their gills thankfully.
I picked up 12 a while back for my 75g planted Discus tank. I still have 10! One died right off the bat; the second death was a bad case of dropsy. The rest seem to be enjoying themselves and some of our favorite fish.