I'm pretty sure it's diatoms. I've had dino's in the past and what I have doesn't look like that (and the snails didn't this response to it either). It's got that golden brown dust look as oppoed to the brown snotty look of the dino's and it doesn't have the associated air bubbles. And it's really only on the sand, so I thinkit's just diatoms using up the silicates in the new subtrate. And my conch is eating it and is the only gastro who is super healthy in the tank at the moment.
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