that looks great!!
make sure that when you try to integrate biskig back in you keep a close eye on your birds, as in dont leave the room for longer then five minutes until you're positive they're fine. They might pick on him because of his band or it might just be because hes older and weaker theres a member on this forum (prettybird) who has a keet who always has to stay separated except when the keets are playing because he has splayed legs so the other keets pick on him.
here is some info on scaley face
http://www.birds-online.de/gesundheit/gesparasiten/grabmilben_en.htmand i got this from another website
"The big problem with Scaly Face is not how to treat an individual bird. The concern is how to stop the problem from affecting other ‘in contact’ birds. Scaly Face is quite contagious and if left untreated, other birds will succumb to the disease. In addition, because the infection only becomes obvious after six to twelve months, it can have quite a toe-hold on a flock of birds before the problem becomes obvious.
The mite spends its whole life cycle on the bird thus it appears to be transmitted between birds by direct contact. It is also likely that some birds are genetically more susceptible to the mite than others. It also seems able to burrow into wooden perches in the cage. Therefore, you should replace perches in an infected cage weekly, using branches from native trees.
Ivermectin can also be used to control Scaly Face in an aviary of birds. Your veterinarian will advise you further on its use and on other procedures to control the problem."