When you have over 1500 posts on a saltwater fish forums...just talking about tanks...
When your email has something to do with saltwater fish...
When you have 7 tanks...
When you spend as much on electricity for the tanks as your whole house.
When you take in fish that can no longer be cared for by thier current owners.
When your fish get filtered water and you drink tap.
When you actually have a operating expense budget for your tanks.
When you aquascape your tank tons of times to get it JUST RIGHT
When everyone at work asks you hows the tank and not your family.
When you are up at midnight posting on a sw forum when you know you are addicted.
And personal to me:
Design your house around tanks
When you drive 1,500 Miles to pick up a tank..
Drive through 2 of the largest Hurricanes in Floridia to get it. One was charlie.
Cut open a Brand new wall to install it.