I have a 10 gallon planted tank on my kitchen counter. I have a red claw crab that spends 90% of its time in the hang on the back filter. but today I come home and notice (somehow) a little crab in the front yard grass! and I know its my crab cause a month ago when it shed its skin/shell it shed its right claw along with it. how the heck did it climb down the counter, across my living room, out the front door and into the lawn. I did water changes yesterday and cleaned out the filters and saw him in the filter yesterday.