I think yours is the bigger one as they all have some spots but yours will fad as it gets bigger, they may stay though. As you can see the one in the op's pic has many more spots especially along the back. Mine is the same. He had the spots along the back and at almost 8" he still has all those spots, none have gone away.
very nice high fin on that flagtail! my ff had a nice hgh fin before but my aro keeps biting it off. doesnt grow back anymore lol.
Flagtail Prochilodus;
Insignis- spots fade away, 15"+ no problem.
Taeniurus- More spots and stays spotted, 12" max.
Had one of these (insignis) in my 175g bowfront. Growth wise it kept pace with my rtg and at 15" became to hyper and I sold it. Catching and transporting it was a bigger challenge than moving an adult arowana.
Have read that when young the ones with more black spots, going further towards the front of the body are taeniurus.
I plan to buy another as soon as I can find the smaller variety.
PISS ME OFF..... Someone stole him last night...... but i cant see any big bellies I just cant get a break with this fish..... lol
I have always believed it's the other way around..
Insignis - more spots, 10-12" max..
Taeniurus - spots fade and can grow to 24"
its my understanding that the true "charming phoenix" is taeniurus
Also there are definately more then 2 species of phoenix.. Theraputa and others all share similiar looks..[/QUOTE
Checked my google search ("flagtail prochilodus") again, and thats what the first three hits showed.