Originally Posted by AbsoluteRanchu

I find that the exercise is most helpful for younger fish and the effect seem to be more dramatic. For older fish, I usually give nature a chance since when the fish reached it's adult size after three years old, the tail will automatically become thicker. The thicker tail will solve many of the wrinkle problems in the fish when they are younger. Give the fish a chance, it will surprise you. Any how, you have other nice parts of that fish that you could build up that will possibly counter balance that negative part of the fish. And if worst comes to worst, the fish still would make a great seed ranchu.