This product provides bio-available nitrogen, magnesium and micronutrients for lush freshwater plant growth. Contains no phosphates to cause unwanted algae growth. Considerations for use: first use Kent Freshwater Plant supplement which provides iron and other essential trace minerals for lush greening of freshwater plants. Then use this product, Pro-Plant with Pro-Gro plant growth accelerator to spur rapid plant growth. Both products are phosphate free so that they do not cause unwanted algae growth!