Goldfish has been decent in the past. It's never been a top tier event but now it's competing w/ Sakura Blessing for bottom of the barrel. At least you could get a decent amount of Hidan frags and refine them. I think last fishing event I got 4 Neji frags, and he was set at 100 points, so this will probably net you about 8 Gai frags for the entire event.