Thank you. And thanks for your help. I found some turfa rock which is limestone. I'm planning to buy a peice to test the tap and put a couple peices in my tank. My goal is to raise my ph in the 29 gal asap because I'm planning a 56 gal build. I'm planning to use crushed coral and limestone to maintain 8.2 from the start and I don't want to shock them when they make the switch.