Maybe I glazed over where you explained, if so, my apologies...
How did the balding happen? Did it come that way, or did it regress while you had it? Was it localized to one area, or one patch, or did it spread? Any other details on the balding of yours? Anything you noticed that is worth mentioning? It doesn't look bald in any of your pics, that's why I'm curious.
And, have you gone any length of time with NO feedings? Or do you always feed?
It gradually showed itself as the gig settled in and got bigger... When you sit and stare at it, there is one little section starting from the mouth and going out a bit that isn't just a row it's like a nice wide patch and there are others as well so certainly not localized. This guy came bald in a lot of spots, and became even more bald as he expanded, got comfortable and got huge.. What I noticed was, none of the bald spots did anything, until it completely colored up. Now, that it is completely colored up, the baby tentacles are growing EVERYWHERE... in the bald spots, and I'll even see random ones in rows that I think are fully populated.. It's easier to see in person, sorry, hard to capture with pictures.. I probably notice more because I stare at the thing on a daily basis.
For the longest time I was feeding every single day on schedule in the morning, then went to every other day because it blew up in size overnight, just like the green. Now I feed target feed both 2-3 times a week.. if I kept feeding daily it would take up the entire tank in no time, but at the same time I want to provide it good fuel to grow those tentacles back, so I'm torn..
There was a period of a week or two I got lazy and forgot and seemed like it was ****ed off, so I started feeding again... .maybe it was just my head, but seems like this is a hungry fella.
edit: If you look in the first picture, about 2 o'clock.. you can see the baldness.. it's like that whole patch area, and more toward the mouth, not anywhere is it bald on the outside or even from the middle out.