Our pocket friendly “Reef Rations” combo packs are designed to help you establish a healthy, self-sustaining copepod population in your marine system.This combo includes live copepods paired with freshly cultured phytoplankton — their primary food source. Together, they create a stable food chain for your reef, feeding finicky fish and helping control nuisance algae. Ideal for seeding refugiums, boosting biodiversity, or simply giving your tank a nutritious edge.Each bottle holds 500ml, so: Small pack = 2 bottles (1L total) Medium pack = 4 bottles (2L total) Large pack = 6 bottles (3L total)