Yes, I use the terms interchangeably. I will try to say "grow bed" from now on because I am trying to grow basil and some parsley and mint.

If the worms can reproduce in the grow bed, then that would be cool to feed the fish the excess worms! However, I was getting from user JCO that worms were no good and he seems to suggest a Bio Filter instead of resorting to worms in the grow bed.