They will provide a long lasting nutrient source essential for healthy plant growth. How To Use?. Push down to the bottom of the substrate as far as you can. Replace every 3-4 months or as needed. Other competitor tabs claim the fact that they lack certain nutrients(Flourish tabs dont contain nitrogen or phosphate) is a good thing.

They will provide a long lasting nutrient source essential for healthy plant growth. How To Use?. Push down to the bottom of the substrate as far as you can. Replace every 3-4 months or as needed. Other competitor tabs claim the fact that they lack certain nutrients(Flourish tabs dont contain nitrogen or phosphate) is a good thing.