Hello! I am new to aquarium life, with a tank started as a gift to my now 7 year old in Christmas of ‘19. We have a 20gal tank with five Glofish (actually four and a white skirt tetra) and a late (and soon to be replaced) corydora. We initially had issues getting our tank to cycle but finally guessed one of our tank decorations might be leaching chemicals and things have been pretty smooth since. I found this site recently when one of the Glofish started having what appears to be a swim bladder issue. He then got caught in our silk plants and got quite injured, with internal bleeding and a damaged top fin. I did not think he would last a day but four days later the blood is no longer visible and he is still swimming and eating. However he spends most of his time lying on his side and seemingly trying to hide himself in our plants, or wedging himself into corners. Is this what fish do when they know they are dying? Or is it an instinct to hide themselves so they can peacefully heal? We tried adding stress coat and have isolated him in a mesh breeding tank so he can lie down in peace. I’m also trying a smashed pea in the hopes it helps with swim bladder. (Attaching two pics - one from three days ago and one today). Any ideas welcome! I just don’t want him to be suffering.