Yes indeed John, I somewhere read in an article I belive it was on H. tokyoensis that the little juveniles hide in the holes of earthworms, which is so similar to what I see when raising them here with my stone-with hole trick.
Did you know that I raised once over 60 juvenile H. Dunni, starting at 3 cm , in plastic tanks of 60 cm. Kept them in there with those stone setup (with plenty of moss too) and took them out about 18 months later when they reached the size of approx 7 to 10 cm... I lost some single ones, but over 90% came out ok.
But then I find H. dunni to be a VERY hardy species ... wouldn't do this with H. tokyoensis, since this species is somewhat fragile overhere with me.