i know this is a crazy thread bump. but here it goes any way.
I have these "yellow fin" or "lemon fin" tinfoil barbs also. I have had them for about 6 months. They are around 7" now. They are hogs when it comes to food. Here is a short video from about a month ago. http://www.youtube.com/watch?v=MR_M_ym4Vds