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I did check the pH multiple times since the beginning. It is currently in the low 8s. The chunk was at least a decade old, although it had never been submerged in waterConcrete is not recommended because it has silica sand. Usually Portland Cement is used but you have to really cure it good or your pH will skyrocket and can kill pretty much anything and everything in the tank. I just made some cement rocks for my tank. It took close to 3 months to freshwater cure to leach the lime out then another couple weeks of a saltwater soak/cure just to make sure anything that started growing on it in t freshwater soak isn't going to die and ammonia spike my tank. If you have a chunk of concrete in the tank check your pH? I was reading a pH over 11 while my concrete was curing.