Hi guys and gals, I’m in need of some general info about my newly found hitchhiker. He had to have came with my live rock from Tampa Bay Saltwater that I started my 90G mixed reef with 7 months ago...the thing is I didn't even now I had him until a few days ago. I was scanning the tank with my red-lensed flashlight as I have done almost every night since starting the tank and boom, he was just sitting on this rock. I had to wake the wife up so she could see him and snapped a few pics. I've had the tank stocked with a clean up crew for about 6 months and have had 5 fish for the last 5 months. The blue-legged hermit crabs have been disappearing slowly but I also have a few gorilla crab hitchhikers that I haven't been able to get rid of so I chalked it up to them. I have also lost a few astrea snails but I know they have a problem righting themselves sometimes. My fish haven't been touched and are a large 4" gold stripe maroon clown, flame angel, royal gramma, sixline wrasse and a watchman goby. The last 4 were all bought at about an inch to an inch and a half in length and are now between 2 and 2 and a half inches. Should i fear for my fish since spotting the gulf dwarf octo? I was told that they do not live very long but have heard three different life spans, 6-8 month, 8-12 months, and 2 years...which is correct? I have attached a pic and the colors are way off because it was taken using the red flashlight...so it was either this color enhanced one or a black and white. Thanks for any info you can give me.