...and if it is not, there are few other hitch hikers that are worse
At least a lot of mantis shrimp are attractive.
At the LFS where I worked, there were three options. There was a 40,000g display, a 3,000g salt pond, or (if you wanted a chance to see the beast), the 12 g eclipse dubbed the 'tank of ill repute.'
I have filled the back filter area of my nano with a bunch of LR frags and threw a little hitch hiker crab in there (sump of ill repute). Couldn't bear to kill him. But didn't like watching those glowing red eyes either.