All things being equal I always thought it was clam shells and in particular snail shells that were particularly dirty with PO4 and not ideal for recycling in a calcium reactor. Otherwise though, most aragonite reactor media is just crushed coral, but generally of a more uniform granularity. Basically if you have a means of combating PO4 buildup anyhow (gfo), you're good to go, IMHO.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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