Hi, I just purchased a Nautilus shell to attach my aquatic plant to. It was a shell from a Cephalopod which is in the cuttle bone and squid family. The shell has some natural peeling going on and I tried soaking it in a bucket before placing it in the tank but it does not sink easily. Now I am realizing that this is going to raise the PH of my tank which is already high. I am wondering if anyone has used this type of shell in their freshwater aquarium and has any tips on how to prepare it for the tank or if it will dramatically raise the PH? Thanks!