What I do is break a piece off the frozen bar while holding the outside of the bag, then use tweezers to pull out the broken piece & I put it into a tiny container that has a very small amount of water from their tank in it. I zap it in the microwave for approx. 5 seconds (found by trial & error - I cooked a few "batches" way too much & had to toss them before I hit upon the 5 seconds as the best time). It doesn't thaw them completely, but helps the process along. I use the tweezers to break apart the "chunk", then wait about 5 minutes & they are ready to serve. I use the same pair of tweezers (donated to the cause by my wife, BTW, LOL)
I've never had an issue with bad blood worms from that company.