In Hawaii, these Indian Blue earthworms (Perionyx excavatus) are pretty common vermicomposting worms and are much more active than the *ordinary* red wrigglers (Eisenia foetida). I don't think you'd ever find red wrigglers hanging out on the insides of your worm bin. They grow faster, they reproduce faster, and zip around and are so much more fun to watch! My friend Jennifer gave me a bunch of red wrigglers and they are pretty sluggish compared to these that have, I dare say, personality! And yes, that is castings on the side. Poop all over the place!