Old sand still good?

  • We are currently upgrading MFK. thanks! -neo
It has a pinkish red mouth with a tanish base and clear tentacles with white tips on the end. It may have been on my live rock and I just didn't notice it? Or maybe it is something completely different. I'll try to get a shot of it but it's at a tough angle.
 
If water is a prob and ur stressin out about all this id make life easy buy some PFS its super cheap comes pretty clean so less rinsing...and looks great

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Well the sand is fine, it's done and looks great. I wasn't stressing about anything lol just wondering if it was a good idea.
I do have one question though not related to the sand but to the livestock. This includes 1 four striped damsel named killer. :D Haven't had a tank mate for him in two years and I've pretty much ruled out other damsels. Was wondering if a small goby or even any species of shrimp would work with him? Is it even worth to try?
 
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