ISTA Water Plant Slow-Release Fertilizer Ball

ISTA slow release fertilizer ball helps to replenish and add essential nutrients that plants need for growth. Useful for old soil or substrate that needs refertilizing yet does not alter water pH or kH. Harmless to fish.

Each box contains 20 balls.

Instructions:
Bury fertilizer ball 3-5cm deep under gravel and 2-3cm beside the water plant.