3D Tunze 3155 ATO Plastic Rimmed Tank Adapter Size:1" width Larger stock tanks have a

Larger stock tanks have a wider plastic rim/brace

Frag with one large polyp and at least one small polyp started

Stunning Zoanthid

From Queen City Reefs

3D Tunze 3155 ATO Plastic Rimmed Tank Adapter Size:1" width Larger stock tanks have aThe magnet holder for the Tunze 3155 ATO bumps up against the bottom of the plastic rim in a standard tank when trying to raise the optical sensor water level high enough to prevent HOB filters from excessively splashing and making noise. This adapter hooks to the plastic rim with nylon screws. The two plastic tabs that hold the emergency shut off float switch and the optical sensor are highly adjustable up and down and will give you greater ability