I have done and used DIY rocks years age.I played with regular and white mortar,oyster shell small pieces of natural ocean rock, mixing salt,pasta and other biodegradable product to make the rock as natural as possible and at the end still was unappealing.
The few problems I ran into is that some rocks where very brittle and break or too dense and leach for high ph.The most problem was keeping the ph at bay through the curing process and believe me that took forever.
Dry rocks now a days is cheap and easily accessible without spending all that money.
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