Very suprised, I never knew octos did this. I saw him flashing extreme changes from dark to light brown, just like cuttlefish do the "passing cloud" look, and upon further investigation I noticed the peppermint shrimp a few inches away! (Poor guy has survived for 3 weeks in there, but every time I got to get him he moves away into rocks...he suprisngly must have been in the LR for sometime as a baby). He didnt catch the feisty little shrimp, but this was the first time I ever noticed this behavior, Im keeping my camcorder close by in case this happnes again.