Pacific Brown is not enough to go on to have a clue to the species so the best we can do is make a suggestion for what typically is shipped under that name from the Pacific. Most of the Pacific octopuses are imported from the Philippines and will do well in temperatures between 76 and 80 degrees F. Often they are Abdopus aculeatus (or a member of the Abdopus complex) but we have also seen a number of animals in the Macropus or Callistoctopus group. Assuming it is imported from this area, the temp would be the same but foraging time of day/night will be different. A 45 gallon or larger display tank with sump is recommended.
Here is a post that gives a little bit of info on each of our commonly seen species.