Okay, I give up on Advanced Search - either I'm an idiot, or my phone's browser just can't handle it, so forgive me if there's a 30 page thread about this topic that I'm overlooking. I have four nearly 4wk old CX. Feeding fermented <20% starter. Have been withholding feed evenings 12 hours, since day 21. Their hocks will bend backwards at times. Very creepy looking. :/ Doesn't seem to be causing any pain, stress or distress, so at the moment I'm in no hurry to process them. They are mobile - slow compared to the layers in with them, but well able to get around. Seem just fine in all other ways. I'm assuming I'm seeing some sort of a nutritional problem? Any tips on what's happening and how I can prevent this in future?