Oooh! A bubble nest - that IS a good sign! He may not be getting better - but not getting worse is also a very good thing right now. We keep sending White light to Ghost, and your other Bettas - as wll as everyone in southern La.
Unfortunatley, things look very bad for my friend. I hope the ending will be quick.
Sometimes, that is the best we can hope for... Thanks for your prayers. I am thinking of your cousin, too, hopefully the prognosis will be better for him!
My Betta Felix died of old age - he did not have tumor but he did, in retrospect, start showing signs of aging. I guess he if he was a person you could say he had the fishy equivalent of passing in his sleep - it was fast and peaceful. If I had realized at the time, I would not even have removed him from the tank so he did not have to be stressed more... but still, he went quickly and quietly.
Fish can live with amaxing diabilties! So, you never know how long Ghost may be able to cope with tumor! If I were you, I would do exactly what you are planning -I wish you all the very best - I hope that Ghost can hang in there!