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That's absolutely not true. Most rocks will give off carbonates which can alter water parameters. Cause great pain in keeping the right conditions for shrimp. If given the choice, avoid rocks, if you don't want to constantly be adjusting water parameters. However, if you are keeping Sulawesi shrimp, then the opposite is true, since Sulawesi shrimp prefer high pH. Then rocks are almost a must have to maintain the high carbonates for a high pH. Driftwood on the other hand will leach tannins and natural acids which help reduce pH and maintain the conditions shrimp prefer.