I was curious what the differences are between telling apart an Oxydoras Niger, and the smaller sized species that look the same. I was sold a 7" one labeled as "Oxydoras catfish" from a very knowledgable shop source, and was told it was not a Niger, but a smaller 2 foot or so species, but I just want to make sure - it's put on over an inch in less than a month... Anyone? Thanks.
