you might be a reefneck if your coworkers ask what you are going to spend your $800 bonus on and you cant bear to tell them the truth (tank upgrade, here we come!) because they will think you are a sad, sad little person.
you might be a reefneck if you (work at the eye doctor) and worry about when presbyopia will set in, because then you wont be able to stick your face right next to the tank and see those tiny featherdusters or copepods without using reading glasses.