I have a pair of Livingstonnii's about 5 inches long, they obviously have a long way to go until they are adults but lately I've noticed the female and now the male are resting on the gravel from time to time. They seem fine other than this, they eat and swim and are active. I've heard that wild Livingstonni feign death to capture prey and I was wondering if maybe they might be doing the same type of behavior in my tank that they would do if they were in the wild?