This is from Scott W. Michael, who recommends the following minimum sizes in Marine Fishes, 500+ Essential-To-Know Aquarium Species, Microcosm Ltd., 1999:
- Acanthurus achilles, Achilles Surgeonfish, 100 gal (380l).
- Acanthurus coeruleus, Atlantic Blue Tang, 75 gal (285l).
- Acanthurus japonicus, Powder Brown Tang, 75 gal (285l).
- Acanthurus leucosternon, Powder Blue Tang, 100 gal (380l).
- Acanthurus lineatus, Lined or Clown Surgeonfish, 180 gal (680l).
- Acanthurus nigricans, Whitecheek Surgeonfish, 75 gal (285l).
- Acanthurus olivaceus, Orangeshoulder Surgeonfish, 135 gal (510l).
- Acanthurus pyroferus, Mimic Surgeonfish, 75 gal (285l).
- Acanthurus sohal, Sohal Surgeonfish, 180 gal (680l).
- Acanthurus tristegus, Convict Surgeonfish, 75 gal (285l).
- Acanthurus tristis, Indian Mimic Surgeonfish, 75 gal (285l).
- Ctenochaetus hawaiiensis, Chevron Tang, 100 gal (380l).
- Ctenochaetus strigosus, Kole's Tang, 75 gal (285l).
- Naso brevirostris, Spotted Unicornfish, 180 gal (685l).
- Naso lituratus, Orangespine Unicornfish or Naso Tang, 135 gal (510l).
- Naso unicornis, Bluespine Unicornfish, 200 gal (760l).
- Paracanthurus hepatus, Pacific Blue Tang, 100 gal (380l).
- Zebrasoma desjardinii, Indian Ocean or Red Sea Sailfin Tang, 135 gal (510l).
- Zebrasoma flavescens, Yellow Tang, 75 gal (285l).
- Zebrasoma scopas, Brown Tang, 75 gal (285l).
- Zebrasoma veliferum, Sailfin Tang, 135 gal (510l).
- Zebrasoma xanthurum, Purple Tang, 100 gal (380l).




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He's still small, so I guess he will be okay for now. Do they get really big or is there another reason why u need a bigger tank?
