Marina Betta Gravel - Jelly Bean - 500 gAdd a splash of color to your betta aquarium with Marina Betta Decorative Gravel. The expoxy-coated gravel has smooth rounded edges to protect delicate Betta fins. The gravel is inert, preventing it from having any adverse effects on water chemistry. For freshwater aquariums. Jelly Bean Gravel. Key Features : Decorative feature for Betta aquariums Smooth, rounded edges to protect delicate fins Pre-rinsed & Dust-free Epoxy-coated, will not adversely affect water chemistry Stone type:Jelly Bean Size: 4-5 mm Net Weight: 500 g