I ordered a bottle of Roti-feast from my LFS last week and when I went to pick it up, they said they didnt get it in their shipment. To make up for it they gave me their store use bottle of Dr Gs rotifers for free which has an expiration date on the cap of 6/21. The guy said it was still good and they use it in their tanks. I smelled it and it certainly doesnt smell like roses but not vile either. Do you think I should use it or throw it out? I also picked up a pack of Hikari frozen rotifers. How do those compare to the Dr Gs or Roti Feast?