Decide what type of tank you're wanting to achieve. If it's gonna be a softies oriented reef or LPS or SPS? Do you want to keep shrimp? These decisions will let you know what type of lighting (although with an anemone I assume you already have MH) you'll need & what type of fish can go into the setup. Certain fish are semi-reef-safe (ie. flame angel) so if you want the type of coral those fish love to pick at, then those species of fish or coral will have to be excluded. Colts are generally left alone by most fish so you should be safe there. 38g is also not very much volume so dwarf angels are probably a good choice for a center piece fish. You can also look into the Lamark's or Watanabe species of angels that aren't coral eaters.
Most tangs will outgrow your tank fairly quickly.
Anthony
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