All Aqua Natural products are sustainably and responsibly sourced under license and have a lower carbon footprint than resin ornaments or plastic rock copies. Pisces USA exclusive range of all natural products are the eco-friendly way of adding attractive tones and warmth to your display. All rocks and substrates are completely safe for use in any aquarium and will have minimal effect on water chemistry. Glitter Rocks are 100% natural, sustainably sourced and non-toxic. Directions: Care Rinse thoroughly before use to remove any debris or dust from shipping. Do not use any chemical products or soaps as these may contaminate the aquarium. Remove and clean periodically to maintain a healthy aquarium. Caution: Do not boil the rocks before use or as part of the cleaning process as this may cause the rock to split. When placing in the aquarium make sure you add them slowly and gently. Note: Mica rich quartz has a naturally flaky/scaly surface which may shed a few particles during transport and handling. This is normal and of no concern; simply rinse and use.