Also do you think the tentacles are short and the foot not setting down because of too much light? I can try cutting it back by 50% tomorrow ?
Is this guy deflating? At all? If not, then I would not cut the light, but I would actually think about increasing it (only if I was able to stay home to monitor it's response to more light, so negative response to increased light can be adjusted ASAP after negative response is observed...I suspect hammering a deflated nem with light in early acclimation, or a recovery, can be more damaging than good, IMO, but ultimately they need lots of light...I know, a contradiction). If I remember correct, this guy has already gotten over the initial shipping stress, right? By now, it should be in the "rebuilding" stage of it's internal zoo count, past the shipping/purging state...ready for more light...and flow... If you can't watch it in person, (get yourself [and us] an IP camera

) during the photo period as you adjust it, be careful increasing...go slow... First big hurdle to get over is deflating. Once it's stable, not deflating (and in your case, after it is attached too), SLOWLY, ultimately, these guys need more light and flow. Got to get there sooner or later (sooner is better, but don't kill it in a rush). Don't worry about tentacle length. That will increase as health does, along with color improvement. In looking at your video, if it was mine, I would do something like the pic below, so I could turn up the flow a LITTLE bit. Just a little. It just looks a bit stagnant in there. It still needs to be gentle flow. IMO, most of the tents need a little flow, just enough to rock them a little at the tips, but not blow it around... Tall order. If it poops, the flow needs to be able to carry it away. This will be hard to achieve with a nem that won't anchor, so you/it may have to settle for a little less... until it anchors. Gentle is key, for now.
A tuperware container with a peice of fully cured live rock, but not live rock with lots of stuff on it. I've got a few pieces in my sump, in the dark, I can pull from when I need the bacteria culture, but don't want the photo process of the junk that grows on it in our every day reef rocks (the nem will cover it, blocking light). If this makes any sense... Just to keep the container with the nem from floating around, and help with the junk the nem discharges (hopefully it never is needed, but JIC something comes up and water cant be changed on time-it happens). Also, if the flow is on the higher side, it can retract into the container for "shelter".
Keep up with the high standards of water quality. So far I don't see anything that would stop your guy from making a come back... But, it may take a looooong time... to return to it's former glory... AND a LOT of work. If you've already done the suggested amount of days of cipro already, I wouldn't do any more. I've noticed with mine, the day after I stop doing cipro, they tend to "look" a little better the next day with 100% new water with no cipro. Not a huge improvement, but overall just look a bit "happier", or maybe it's just me that's happy because they're still alive, and the hastle of treatment is over!
Just my gut, your nem to me, looks like it's in need of a little more flow and light. It's hard for someone like me to give opinions and recommendations as to improvement on these animals, there are so many details that go into it, and IME, it depends on the animal (and their response to changes). In my house, I give my gigs one free pass (one deflate). If it happens again with in a week or few, I treat. I'd have to look, but I think I treated one of my blues 3x's? I'm not willing to "let it ride" when it comes to gigs anymore.
I think I read recently, a great tip (Pretty sure it was Minh who stated). Take a picture everyday, same time, and compare. You should see the progress or regress.
Again, I suck at getting all the details. I added lines after I reread, so if it doesn't make sense, I'm sorry... Best of luck. Please keep us updated.