You're fine. Those products work quick and the amount of ammonia provided from 2 small fish in a 65g will be marginal. Just don't feed like crazy for the first few days.
While nitrite wont be toxic enough, with fritz zyme, you should have put fish in right away. Adding the raw shrimp produces more waste that isnt necessary. Wait till ammonia is 0 or at least where you have to question if there is Ammonia. tests arent always accurate but red sea is pretty good.