Caribsea eco complete planted aquarium substrate is one of our most popular products and no wonder its brilliantr grain size 025 7mmr contains iron calcium magnesium potassium sulfer plus over 25 other elements to nourish your aquatic plantsr eco complete planted aquarium substrate contains all the mineral nutrients needed for luxuriant aquatic plant growth without nuisance algaer the eco complete is iron rich which eliminates the need for laterite and is also nitrate and carbonate fr