Here's a link to a 3 page thread. On the 6th post on the 1st page are links to two profiles on Austroloheros (chanchittos).
http://www.google.ca/imgres?imgurl=..._enCA355&tbs=isch:1&ei=tkszTeGQGsSblgf7rdT7CQ
Another threads that might interest:
http://www.google.ca/imgres?imgurl=...&ndsp=21&tbs=isch:1&ei=iUozTfW_G4KclgfKxISjCg
Even though "oblongum" probably is the most likely Austroloheros for your fish to be, I'd be cautious about jumping to the conclusion that it is "oblongum" rather then some other Austroloheros.......there are other Austroloheros species with blue speckles, both described and undescribed. And they are all similar looking fishes. Grow your fish out a little bit, then it maybe more obvious which species it is. Though I am sure it is not a convict