The sixth fish is the mystery fish.

But really, I just messed up. *snicker* Maybe that angelfish was shy, and didn't want to introduce himself. (Could I go back and add him in now, after the fact?) At one point I did count six fish, but when I went in to take close ups, I only found five. He must have been hiding.

Now, let me divert your attention away from searching through other chapters for continuity errors... :P (You will find MANY, believe me.)