What is new? Couple of days?
Put him in a lower light, soft (not dead/still) flow area and be patient. he can "blow" his plummage and still be in there. Will grow another in a some weeks.
The only way I know If one is dead - or moved out and will begin to make another tube somehwere else - is when you lightly touch the tube and don't feel anything move - or feels empty.
Anyway, be patient and see what happens.
"Life may not be the party we hoped for but while we are here we might as well dance!"