O I dunno Dave.. just a general feeling I get with them. They have ups and downs in the greenhouse and it took me a while (ie significantly longer than most species) to really get a handle on them. Initially they just grew.. never getting much larger. Which usually indicates temperatures a little too warm. (or not enough feeding or something). They do seem quite resistant to rotting and humidity fluctuations though as I haven't killed many once settled into the greenhouse. They grow pretty well now but for some reason they occasionally go into this weird mutant type growth. I don't think it's because of my environment as it appears randomly. My gut feeling is there is a problem with the TC and some mutant gene just expresses itself out of the blue then goes back into hiding.