I've been having the same discussion all week so I'd be interested, too. I bought these 4 fish labeled Blue Acara and someone (knowlegable) said he thought they were probably Green Terrors. They're so similar it's really hard to tell them apart when they're young. Plus add to the fact they're probably being inter-bred.
Having a hard time getting this to post, I'll try again. Here's the pic of one of the 4 I got.
I'm thrilled with the fish now after seeing how they act. Beg like Oscars, they practically do flips when I walk up to the tank. They'll literally eat anything I put in the tank. If I'd have know this is what GT's were like I'd have had them a loooooong time ago. If Green Terrors are so much like Blue Acaras....what exactly is the difference? I was also told their personalities are very similar, too.
Here's a better picture on one of the others showing all the colors. These guys are under 2" and their colors are so pretty. I can only imagine how gorgeous they'll be full grown.
I'm not near the expert some are but judging from the side and pretty color on their fins I think they're Green Terrors. Blue Acaras supposedly don't have that cool red lining on their tails.
That's a gorgeous pair!
Blue Acaras supposdely max out at 6", too.