welcome to the forum. More information abd pictures will help.
A quick way to share a pic is click go advanced under the text box, then hut tge paperclip, choose yiur picture then hut upload on the far right. When loaded close the window and post. It will attach as a thumbnail.
A molting bird will never look bare or loose all the tail feathers at once. So it could be behavior as in he is pulling thrm out. This can be because he has a bacterial or yeast infection in gastric system. Or other health issues. Do getting him checked out by a certified avain veterinarian is the first step. And yes most of us have to drive an hour or 2 to get to a certified avain veterinarian. But uts absolutely worth it.
I have a special soft spot for blue quakers as my first quaker was my Neptune blue. Whst is yours name?
What does your quaker eat? Quaker really like veggies and leafy greens, all of mine took to them quickly. I also feed seed mix and pellets.
Cage size is important. Spending losts if time out of the cage is important. Teaching foraging is excellent fun, you can do together, and teach them to fo on their own.
Getting 10-12 hours if uninterrupted sleep a night is a must.
Offering baths at least twice a week. Fir me I have a wide shallow sturdy dish, I put fresh water in it daily about 2 inches deep, they choose when to take a bath. But splashing in it with your hand usually has them them run over sbd want a bath. The sound of splashing is very trigger for bath .
Lots of easy to shred stuff, like burds bagel, shredder rolls, yucca chips.
