- you have a specific "arm drying" towel, so as to not to cross contaminate.
- your light cycle doesn't follow day light saving time so you don't throw your corals off, like it does me.
- when you tell your significant other to "turn the living room light off. The fish need to sleep!"
- when your CONSTANTLY ON LIVING REEFS FORUM! :)
- when the tank is cooler, temp wise, than it is inside your house.
- when there's a water spot trail from your fish tank to the kitchen.