Yes they are safe. Walmart or Bi mart is good places. My bichirs and eels love them. Best thing to do is put them in a bin with non fertilized soil and start breeding them. Humidity has to be high. Crushed powder food is the best.oddballfish;4648579;4648579 said:Just curoius is it safe to feed earthworms and night crawlers? Ones you can buy from the stores.