I decided to purchase the little octopus. I used "D's" guidelines to acclimate. SG was 1.022 and my tank is 1.026, took the full 3 hours to bring it up. PH was close to begin with so I just checked it once more before releasing. It is much smaller than I remember or maybe it just looked tiny in the container. I got some photos, still looking for an id, what ever it's species, it sure is cute Could someone tell me how you measure the mantle?