I have two bags of rocks called "River Pebbles" that I bought at Home Depot. Anyone know if these are safe to use in aquariums?

Almost all the stones you will find at the Home Despot are fine for tanks. If you have any doubts a good way to test these rocks can be found here:

http://www.kokosgoldfish.invisionzone.com/...?showtopic=8441

Thanks Daryl! I did see that thread after I had posted and I'll check them before adding to the tank. These are rather large rocks which I think will be great to have in the tank...I won't ever have to worry about my fish getting them in their mouths.