Red Lava Gravel 5–7mm Aquarium Substrate | Volcanic Aquascaping GravelEnhance your aquarium or terrarium with Red Lava Gravel, a natural volcanic substrate sized between 57mm. Its warm reddish tones and porous structure make it a great choice for aquascaping, planted tanks, and biological filtration. This lightweight gravel adds texture and contrast while supporting healthy tank ecosystems. Why Choose Red Lava Gravel? Natural red tones add warmth and visual contrast 57mm size ideal for substrate and top layers Highly