I'm not sure what the problem is here, but I'm hoping someone can help. My Clown Knife (about 4 inches) looks like its losing all its "silver" color and spots and appears to be "cracking". I know that's not the best description for this, so I'm attaching a pic as well.
It's in a tank with another knife (about 6"), an Oscar (about 4"), another cichlid (Green Texas, about 3") and a pleco (about 4").
Water seems to be fine. Normal ph, ammonia and nitrates and holding at about 80 degrees.
Any thoughts?

It's in a tank with another knife (about 6"), an Oscar (about 4"), another cichlid (Green Texas, about 3") and a pleco (about 4").
Water seems to be fine. Normal ph, ammonia and nitrates and holding at about 80 degrees.
Any thoughts?


he's gettin' "big-duded"