I understand the microbiome will change with time, but I'm concerned about adding anything living to a new and sterile tank. My LFS said it's not safe to stock inverts or fish until the tank is 8mo-1yr old at the very minimum and no corals for ~2 years. But I honestly don't understand how waiting that long will benefit me if there's no biodiversity in there to establish itself; the tank is going to be sterile regardless if it's a completely isolated system...
I've read mixed opinions on the snails. I understand some hermits will eat fish food but I've also heard they aren't reef-safe and are hard to eradicate once established. Is there any truth to that?