Tank size: 10 gallons
Inhabitants: two Ryukin Goldfish, several live plants
Filter: Whisper 5-15 plus air stone
Water changes: 30% every other day (I used to do it just twice a week)
One of my goldfish has a bubble on his tail. The bubble is transparent and there appears to be some sort of free-floating yellow granules inside the bubble. The other goldfish in the tank is at the tail-end of a bout with ich, so I do not know if the two are connected or not (see my post "How long does ich last?"). I will attach photos. In the photos the bubble looks opaque, but I can see inside it. Has anyone experienced this before?
Neither goldfish is healthy. They have been in a too-small environment for too long, they were unhealthy when I initially got them, and they constantly plagued with fin rot for which no amount of water changes seems to help.
Is it time to euthanize them? I HATE to do it, but I am concerned that they will only continue to suffer and I am very concerned that the bubble on the one will burst and release harmful bacteria/parasites into the water and ruin the tank for any future inhabitants. BettaBaby was very helpful with my inquiries with the ich problem, and she even suggested at that point that euthanasia might be the kindest option. I think she might be right.