Did you use any live sand from an established tank? Do you have live rock in there? Worms usually come in LS, pods from LR.
The "bio-active" sand does not have most of what makes live sand "live". It is supposed to have bacteria, but it has no pods or worms of any sort. Further, while the stated shelf life is one year, the "effective" shelf life is probably much shorter: what are all those bacteria eating while the bag sits on the shelf?
To determine if you have worms or other critters in the sand, take a look at the edge of your sandbed. There should be some resemblance to an ant farm, with little tubes made by the worms. Also, you can take a red-filtered flashlight and look at the tank when the tank is dark -- wait until after the lights have been off for an hour, to give the critters time to come out of hiding.