DIY fast setting quikrete help would be nice!!

Hellothere116

New member
So I was looking for some help I made some rocks using 50% oyster shells and 50% fast setting quikrete, I've have them in the tank soaking in freshwater, (air stone and wave maker running. After the first 24 hours the waters pH was 10.4 the next day after a water change and 24 hours after that the waters pH was 9.4, then I did another water change and it's been sitting at a pH of 8.4. I tested for phosphates on my tap water and the tanks water both were the same at 1(yes I know a little high) But would you say I'm ready to start curing the the rock in salt water? Thanks hope someone can help!
 
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