MarineAndReef.com carries over 100 high quality reef aquarium supplements from Brightwell Aquatics, Fauna Marin, Two Little Fishies, Seachem and others. Exactly which reef aquarium additives to use is a complicated question. However, all reef aquariums will need calcium/kalkwasser, an alkalinity buffer supplement and a trace element supplement. To make life easy you may want to consider these all-in-one two part products: Brightwell Aquatics Reef Code Part A & Reef Code Part B, Two Little Fishies C-Balance. These reef aquarium supplement products will provide the calcium, buffer and the critical trace elements. Related Articles:How To Color Your Corals I Reef Aquarium Additives Overview