The Purple Tang (Zebrasoma Xanthurum) is another surgeonfish that enjoys some popularity among those looking for uncommon surgeonfish. They are exact copies of the yellow tang (Zebrasoma Flavescens) except for two differences, they are purple and they are aggressive. Their bodies are a deep purple while their pectoral and tail fins are yellow. Their purple colors will darken with age.

Purple tangs are mainly collected from the Red Sea and rarely from Sri Lanka. They retail for a lot more than Yellow Tangs do. Large purple tangs can cost as much as $200 per specimen while you should expect to pay between $80 to $90 for juveniles.

These fishes are one of the more aggressive tangs, similar to the Sohal Tang that are also found in the same area. They are very aggressive towards other purple tangs and members of the genus Zebrasoma. Put them in to aquarium at the same if you wish for more than one purple tang.

They reach 8 inches in captivity despite growing up to 10 inches in the wild. They need large amounts of swimming space. A tank no smaller than a 100 gallon is appropriate.

Great news for those with corals, they are completely reef safe. They are algae eaters in the wild so ensure a large part of their diet in captivity has enough algae.

While they're herbivores in the wild, they will consume a wide variety of foods in captivity. Krill, mysis shrimp, brine shrimp, pellets, they take them all.

Algae sheets like nori are a great algae to feed all herbivorous fish. Price will vary depending on the brand you choose. Julian Sprungs Sea Veggies may be a little too pricey for some. Its good stuff though. They come in flake form too, making feedings very convenient.

Most nori sheets are produced for human consumption, primarily as sushi wrappers. Prices vary here as well, some are cheap, some are expensive depending on quality.

You'll need to secure the nori to a clip. You could DIY a clip yourself and spend a couple of bucks on a commercial type. Some people fold the sheets before clipping while others just clip it as is. Use the suction cup to attach it to your aquarium and you're done, you can enjoy the show.

Formula Two is a good quality algae based mix for herbivores. It has an extra amount of algae in it along with a good mix of seafood, trace minerals, vitamins and more. It comes in 3 forms, frozen cube, flake or pellet.

The best flake for surgeonfish are those produced by two little fishes, Sea Veggie mixed flakes, Formula Two comes in second. It you're looking a great all rounder with balanced ingredients then you can't go wrong with New Life Spectrum pellets.