You can buy different lengths of inserts. When installing use an epoxy adhesive to fill and secure in the new wood. Most inserts have a washer type top that prevents them from going deeper and "headless" type are available that will go deeper into the hole in the wood.
I think you mean "insert nut"? Is this a internally threaded metal sleeve that came out of the wood? If so, you don't want to repair this crib. When that fell out, it most likely damaged the wood around it and it has compromised that hole. Putting a new insert in to the hole will not necessarily work, and the new one will pull out as well. I wouldn't use the crib. Too many deaths in cribs where someone attempted a repair that didn't work.
Inert substrates are particularly important when you keep fish who like soft water and that is the only case you should buy inert substrate.
The inert substrate and the rocks don't alter the water chemistry. You should use the inert substrate particularly important for those keeping fishes that like soft water.
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