Okay, while reading through one of SRC's websites I found this:
"Hi
<Hi, Pufferpunk here>
I have a cichlid tank that is very well established. I love to change the tank display. In the past I have put coral in the tank that I have gotten while snorkeling in the Caribbean with no problem. I have a very large conch shell that I feel apprehensive about displaying in my tank, but think it would look awesome in it! Do you think it will be okay?
<You're not going to like this answer, but I feel I must scold you a little here. As an avid scuba diver (I'm actually leaving for the Caribbean on Saturday), I need to educate you about taking things from the ocean. We have a saying, "Take only pictures & leave only bubbles". Everything in the ocean has a reason for being there. That conch could be used for a hermit crab or octopus home. It is never good to help yourself to these things. Enough said about that.

If there is no smell to it, you could soak it overnight in a light bleach solution, rinse well & then a few hours more in dechlorinated water, before adding it to your tank.>
Thanks for your help. Susan
<You're welcome, Pufferpunk>"
The part I want you to read is this "If there is no smell to it, you could soak it overnight in a light bleach solution, rinse well & then a few hours more in dechlorinated water, before adding it to your tank"
Would this work?