Using crushed coquina for substrate?

dyamazon

New member
I live in Florida and I can get crushed coquina for $1.79 a bag.

I realize it isn't "live", but would this work ok as a reef sand substitute?

Or would it pack down too hard for the sand sifting creatures?
 
Isn't coquina mainly made up of pieces of shells?
I wouldn't use it due to the phophates in the shells.

jmo,
Sean
 

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