Check the listing for details. 20x Substrate Fertilizer Tabs Glosso Factory Planted Aquarium Root Micros Macros. Condition: New. Listed at 11.90 USD. Glosso Factory Fertilizer Tabs are designed with a balanced blend of slow release fertilizers.Instructions:Press tabs into substrate near the base of rooted plants or 3-6 inches apart or as needed. Replace tabs after 3 months. Recommendations:Use in tanks with at least 1-2 inches of substrate. Press tabs deeply into substrate. Depending on planting density increase or reduce tab spacing.Analysis:Nitrogen (N)....................1.33% Phosphate (P2O5)..........0.65% Potash (K2O)..................5.18% Iron (Fe)...........................2.3% Magnesium (Mg)..........0.215% Manganese (Mn)........0.1935% Sulfur (S)........................1.12% Calcium (Ca)..................0.22% Boron (B)........................0.02% Zinc (Zn).....................0.0091% Cobalt (Co).................0.0015% Molybdenum (Mo)......0.0021% Nickel (Ni)..................0.0002%Specifications:Tablet size: ~ 1cm cubeTablet weight: ~ 0.68 +/- 0.1 gramsStore at room temperature with bag sealed. Free Shipping! Fast Shipping! USA Seller! These will ship from the US. Please ask any questions