Is my Mimic Tang OK?

[Myka]

Looks like bruising which I've usually found is either due to an internal infection (that is beyond repair at this point), or constipation. Brine Shrimp are bad for constipating fish, and shouldn't be the main part of any fish's diet. Brine Shrimp are not very nutritious unless they are gut loaded. The majority of a Tang's diet should consist of algae/seaweed.

Try to get some algae into the fish's diet - that will help if it is constipation. Put some seaweed in the tank on a clip or use a rubber band to attach it to piece of rock. You can even use your glass cleaning magnet to hold a small piece of seaweed. Don't go nuts, only add about a 1" square of seaweed, and remove it and throw it out at the end of the day if it's not eaten.

If the fish won't eat the seaweed, then at least feed him Hikari Spirulina Brine Shrimp which is gut loaded with spirulina algae. Even Mysis Shrimp is a better option than plain Brine Shrimp since Mysis is oily - especially the PE brand.

You can also buy algae-based pellet foods.

Hopefully this helps, and hopefully it's only constipation.