Looking for some feedback on these 2 species. I currently keep Panoptes & I have the opportunity to purchase a pair of Tristis or Acanthurus monitors (one pair, not both species). I have heard that Tristis are quite shy & prefer to hide, with the Acanthurus being somewhat the opposite. Having briefly viewed both pairs this seems to be the case. The enclosure they will be going in is 1800x1200x600.