ReefDose 2 and 4Red Seas highly anticipated ReefDose redefines ease of use and smart functionality for aquarium dosing pumps, offering advanced programming and incredible dosing accuracy for the most demanding applications. The ReefDose doser was built from the ground up to meet the needs of modern reef aquarists. Utilizing Red Seas custom built dosing heads, the ReefDose is capable of delivering incredible single drop precision through a variety of dosing programs.