im in shock and am so upset

. i returned home from holiday last night only to find my beautifull 5 inch orange oranda has dropsy

he's still alive at the moment but he now looks like he's eaten a golf ball and his scales are at right angles! im so upset

! now i know dropsy can sometimes be caused by water quality so i tested it straight away and it came back fine

im just gutted. obv this website says to put him out of his pain but i just cant do it so upset

ps none of my other fish are ill. the rest are eating fine and swimming perfect. i know dropsy is often caused by water condition but from what i read on here it can also be a internal organ problem and as all my water tests have come back spot on i have a feeling its a internal problem

. . . just so upset