The front in the 2nd pic does look like it has a mask when I observe him instead of a stripe, hes the littlest one but he doesnt seem to fear my presence in the tank compared to my other two frontosa. he doesn't duck and hide when I do water change. The fish in the 2nd pic is definitely my favorite. The front in the 1st pic picks on everyone including the masked front. I guess he should be the king of the tank since he's 1" bigger than everyone else.