GREAT video! I wonder what he was looking for in the substrate just after he captured his shrimp. Good idea on for showing scale too!
Thanks! I think the video came out much better than all the pictures I've tried to take of him. It also illustrates his personality pretty well. He's very enthusiastic when it comes to eating. Sometimes, he takes the vial, contents and all, and retreats with the entire thing back to his favorite hiding place.
Another thing I forgot to mention, at about the 0:09 - 0:13 mark, you can see his split third arm pretty well.
I'm not sure what he was digging around in the substrate for either (I actually hadn't noticed it til you mentioned it). I took this video a while ago, right after I first started feeding him using the "vial" method. It could be he was still unsure what to expect, or was still hungry, and was looking for more food.