If you can read all five items on this key, you didn't buy this sweatshirt. You earned it. FIG. 1 is a clean mid-century cutaway of a working saltwater reef system: display tank up top, sump and skimmer below, every part called out in a numbered legend. And item 5? Any reefer already knows why the alk swing is not shown.
The linework is drawn like an owner's-manual diagram, crisp and bold on every shade.
The one you reach for on a water-change morning, or wear to the frag swap when it's finally cold enough. A build-completion marker, a tank-anniversary gift, or a quiet flag for a fellow reef keeper.
Drafted like the manual. Worn like a badge.
