I have had an O.briareus for about six months now and lately it has become pretty aggressive. The other day I put my hand in the tank, close to it's cave, to clean the side and it came shooting out and grabbed it. It took me about a minute to get it off of my hand. I also usually hand feed it shrimp but lately in seems more interested in going after my hand than it does the food or it grabs both and doesnt let go of either. I have stopped hand feeding it, but I still have to put my hand in to clean the tank. Thankfully, I have not been bit. When it does grab me it usually also hangs on to one of the rocks so I can eventually pull away. If the octopus is out, it will come after my arm no matter were it is in the tank. I was wondering if anyone else has had similar experiences and if this normal for the species. I can't tell if it is just playing or if it is actually trying to bite I and dont really want to find out the hard way.