Anyone ever brought a ABK home and have it turn almost jet black? Just wondering, because mine did. When I bought it it looked like all the pictures and fish I had ever seen with darker lateral to spine area, and a tan or creamish color underbody.
its being stressed, when it blackens it just means the water isn't (exactly) agreeing with your knife's internals. although not immediately serious at all, it would be good for the lifespan of your fish to adjust it accordingly.