Gracing the AquaNerd Picture of the Week this time around is the beautiful, yet not so reef friendly, Pakistan butterflyfish (Chaetodon collare). While we don’t have any personal experience with this fish, we have crossed its path several times at public aquariums all over the globe. It is a beautiful fish, no doubt, but its diet of SPS polyps and notoriously finicky nature make it a surprising choice for most public exhibits. In all of the displays we’ve seen the fish, none were in Acropora-ridden tanks, which means the caretakers must be providing them with superb attention and the perfect diet. The butterfly is known for its dark body that is highlighted with lighter colored scales. It’s boldly colored red tail and stand out sharply against the darker background, as does the fish’s vertical white stripes on its face.