they are those things we have to put in our tanks to get other people to look at them.
my 180 is setup in a public area and today i watched as 100+ people walked up to it; reactions vary from not looking at it at all to spending a half an hour with their face pressed up against the tank while they point out stuff they see
some new cleaner shrimp were a big hit
but you have to use those things to lead most people in, then you can tell them that "yes, it is saltwater tank"