It's been a week now and things are still looking good, so I'm starting a journal for the Once-ler. I'm not sure if it is male or female, but I'm sure it'd look smashing in a thneed and if it wasn't already real Dr. Suess would have imagined it... I finally decided to measure some fixed things in the tank and am completely embarrassed at how off I was on my estimates The long piece of live rock (encrusted intake valve- I tell kids it's a pirate hook) that Once-ler is stretched over is 6 in. long. The intake cover in the back of that picture is 3 in. This is a 55 gal bow front tank, 18 in. tall. Based on that, I think the mantle is only 2 in. or so, but the arms are 10- 12 in. for sure. Every animal I have ever put in this tank seems to grow instantly, and taking a good picture is tough if you're at a bad angle to the bowed glass. Yes, this is my lame excuse from here on out for bad photos... The Once-ler has a lurkim, a large piece of live rock that it can hang out in and look out with just eyes to see the whole room. Slowly we see more and more of it as it gets used to it's new home. It's diurnal but still sleeps during the day a lot. The most active times are morning and late afternoon- evening. Finally starting to warm up to the camera! The Once-ler is a hunter, all the hermit crabs are gone and the snails are slowly disappearing, but I've also been sucessful with stick feeding shrimp. Will post more photos soon!