Can I use lava rock for saltwater? Will it work with coral?
2x not worth the risk at the very least it can wreck havoc on PH stabilitySome lava rock is safe and some isn't. It depends upon the composition of the lava rock. Some lava rock contains heavy metals which can leach into the water and kill your fish and corals. Most of the rock used in saltwater tanks is porous and composed of limestone. The porosity encourages bacterial growth and the limestone helps maintain the pH and provides needed minerals for your corals.