DDR DOS Dual Reservoir - Neptune Systems The two outside holes are

The two outside holes are 0

and give you more time to make that correction before its too late and to save your aquarium

Caulastrea

either through plenty of porous natural aragonite live rock

DDR DOS Dual Reservoir - Neptune Systems The two outside holes areAn elegant and highly refined solution to two part liquid storage, the DOS Dual Reservoir's advanced features are Apex Ready! Features: Large Storage Capacity Each vessel holds up to 2 liters of fluid for a total storage volume of 4 liters Connects directly to your DOS dosing system Engineered with a low center of gravity to help avoid tips and spills Optical sensors provide real time fluid levels to the Apex Fusion dashboard Easily removable lids to