Most will agree that you should get rid of the crushed coral.
Suggestions of what you do after that will vary incredibly with everyone you ask. There is a wealth of information and debate posted on the substrate subject on this and many other saltwater aquarium forums.
Do a search and read what others have already said about it. Might be the best way to decide.
I switched to sand a few years ago. Straining all the CC out of the sand was a pain, but well worth it ,IMO.
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Yeah, well, you know, that's just, like, your opinion, man.
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