New telescope eye goldfish not looking good!
I have an established 20g tank that has one oranda about 2 inches. I added a very fancy telescope eye panda goldfish about two weeks ago. He never ate well but he did seem to eat something, but now he's gotten lethargic over the past few days and is laying on the bottom of the tank, arched sideways. Yesterday I was able to handfeed him some seaweed and some bloodworm but he spit most of it out. today he won't eat anything, just gasping. The oranda is fine.
I ran a water check. Nitrite and ammonia are nearly 0. pH is about 7.4. I do add salt. The tank is unheated, so in the upper 60s. There is a large box filter and an undergravel filter which I turned off when he started getting listless as he was unable to swim against the current of the pump. I had just done a gravel cleaning before he was added, and did another partial water change a couple days ago. I keep fairy moss and a bit of milfoil in the tank for them to eat and to hopefully cycle some of their waste. I have driftwood in there too, which seems to grow a lot of algae.
Is there anything else I can do for him? There's no sign of ich or any other external symptoms. I've had the oranda for some months now, but my goldfish never do live as long as they should. Too many die within the first month, and none live much more than a year. Goldfish are supposed to live for years with good care! isn't that what I'm giving them??