Planted Aquarium Concepts Fertilizer Tabs are designed with a balanced blend of slow release fertilizers to supply aquatic plants with the right amount of nutrients when and where they need it. <br><br> Instructions:<br> Press tabs into substrate near the base of rooted plants or 3-6 inches apart or as needed. Replace tabs after 3 months. <br><br>Recommendations:<br> 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.<br><br> Guaranteed Analysis:<br> Nitrogen (N)....................1.33% <br> Phosphate (P2O5)..........0.65% <br> Potash (K2O)..................5.18% <br> Calcium (Ca)..................0.22% <br> Magnesium (Mg)..........0.215% <br> Sulfur (S)........................1.12% <br> Boron (B)........................0.02% <br> Cobalt (Co).................0.0015% <br> Iron (Fe)...........................2.3% <br> Manganese (Mn)........0.1935% <br> Molybdenum (Mo)......0.0021% <br> Zinc (Zn).....................0.0091% <br> Nickel (Ni)..................0.0002%<br><br> Specifications<br> Tablet size: ~ 1cm cube<br> Tablet weight: ~ 0.68 +/- 0.1 grams<br><br> Store at room temperature with bag sealed.