McSierra,
$343 is an extraordinarily good price for all that stuff!! You can easily pay $5 to $8 per lb for live rock. Retail, you probably have listed anywhere from $550 to $750 worth, depending on where you shop.
Big HOWEVER......you are setting up a 29, right?
If you have 60 lbs of rock and 30 pounds of sand, where are you going to put the fish?
If you're not buying a package deal for your $343, I'd back off on the lr. I'd think 30 to 45 lbs would be fine.
Further, if you're going to put 60 hermits in there, I think alot of them may die for lack of food. I'd scale that way back....15 to 20 should be more than enough.....and not until you have some food for them to eat. If you want more of something, go for more snails. Again, after you've had your tank up and running awhile, you could have 20-25 snails.
Importantly, be cautious about your planned fish population. You'll have plenty of filtration and places to hide so you might be able to keep 6 small fish. You'll need to select fish that will stay small and be well-behaved tankmates.
You've done well planning to this point. Congratulations and good luck from here on.
Jim