Okay got the puffer and barbs and so far(a week) so good. He and the six Tinfoils are around 1.5"-2". Like I expected the barbs are entirely too fast for the Puffer to catch, but at this point, he isn't really chasing them. They don't particularly hang out together but if the tinfoils come near him he doesn't try and kill them, or really react much at all. The only time he is a little uncomfortable is when they're eating, where he might dart at the odd barb. At the lfs, they had two Fahakas in a 10 gallon with a ton of guppies and I notice he wasn't chasing any other fish around so I got him(the other one was chasing around guppies like it was his mission in life lol). Now it might be a little bit premature but... I think this combo will work out. He is visibly happier than he was at the lfs and eating like a champ. One of the main things that I think is helping with this success at the moment is that the barbs don't really eat the same food, them eating pellets and the Fahaka eating shrimp. With that said, when the barbs get big enough they might start liking shrimp as well, which might make the Fahaka see them as competitors. I'm sure I'll figure something out just wanted to keep you updated.