I'm no Pro so can only tell you what mine has done over the year since I started..
I started with sand from a break down that I transported with 50kg of Iive rock straight to my tank.
The sand is standard beach type sand - no idea where from or any other specifics about it.
By month two I started seeing brown algae (Diatoms). These came and went at varying amounts over the course of the last year.
Month 6ish, late at night with the lights off and a head torch, I started seeing "grains of sand" moving... But in areas there was no current... A bit of research told me these were live critters AKA dustman of the sea.
Month 12, my sand is now back to its original colour - no alae.
When/if I find my camera I'll send you a pic of my sand now.. but that's almost like wishing for a rainbow atm
That's just my experience, hope it helps.
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