Dried and ecologically sound live rock is a great source for inexpensive rock that is usually devoid of pests and unwanted algae. That said, the rock isn’t 100% free of its issues. Many users have reported that the rock leaches out significant amounts of phosphate, leading to further issues in your aquarium. To deal with this, many people soak the rock in RO/DI water for several weeks prior to placing it into their aquarium, while others soak the rocks in a lightly acidic solution that will dissolve the top layer of rock. Either way, the goal is to remove the phosphate before it can enter your aquarium and cause unwanted algae growth.