had a Brycon melanopterus that looked similar. If it's anything like that, it'll grow FAST,
Melans are what I have...... Agreed, never seen anything grow like my big one did, yet my little one isn't growing near as quick, but I might not even notice with the monster one swimming next to it in a fairly large tank. I heard they only get a foot, but mine's shows no signs of slowing down. I bet the thing's pushing 3" thick.
I bought mine to use as a monster dither, and it has worked well. Very tough, very active, very peaceful.
Using google image search it looks like Melanopterus and Falcatus are the same fish? Taxonomy all screwed up with these guys too? Had one name, name got changed, now there's 2 names???
The black dot is interesting though..... Don't think my big one has a dot, but thought it had a red one when small. My small one DOES have a red dot behind the gill plate.
I think adipose is a different color too??? Maybe there IS 2 species that look very similar.