During the winter I use a heater set at 68 degrees.

I don't chop nightcrawlers. Even my mulleri boy can eat them, and he is tiny. The worms are easily twice his length. Walmart carries nightcrawlers for under $5 for 18 worms. Don't get the neon (glow) worms nor the red wigglers. You can use the "baby" night crawlers if they are in stock. These are about half the size of standard nightcrawlers.

If you are using the worms to inject panacur, you will need a syringe and 18 gauge needle. You can get these for cheap at a feed store or Tractor Supply.