Spruce up your Betta's aquarium with Aqua One Crystal Gems Acrylic Betta Gravel 145g 15mm Purple Passion. These fish safe crystal gems will add vibrancy & colour to your Betta's home. Available in a 145g pack size suitable for most Betta sized aquariums. The Aqua One Crystal Gems Acrylic Betta Gravel 145g 15mm Purple Passion is sure to breathe life into your current Betta's aquarium or is the perfect starter pack for a new aquarium. Also available in other great colour choices.