From what I can tell from the vids, that is not the shimmies. Here is what I see, and I could be wrong.
The fish appears to have a swim bladder issue. If it stops swimming it sinks. It has difficulty staying level. Why?
And once again, we are at a multiple possibilities stage. There are problems not directly with the swim bladder itself but which affect it.
- Internal infection which causes swelling that presses against the swim bladder.
- Constipation which also cause expansion in the digestive system which presses against the swim bladder.
- Worms in a the digestive track causing swelling which presses against the swim bladder.
- Internal parasites can cause all sorts of things.
This is where the unavailable bare bottom H tank would really help. Constipation usually means a swollen gut, not pooping and then likely not eating. You can see any poop on the bottom glass as well as uneaten food. You can also potentially spot any expelled parasites or worms large enough to be seen with the naked eye. Parasites can also be more reasonably suspected if the poop is abnormal looking.
Determining the cause here would most likely be accomplished by what we can see or by eliminating what we do not see not see. If none of the things above that would let us diagnose, then the odds are it is more likely an internal infection. At that point it becomes a best guess situation. The most likely treatment then is an antibiotic.
But the no H tank makes all of this moot.
My instinct say look at constipation first, but no H tank makes that almost impossible. I had a solution which needed a small air pump, but they are out of stock most places that offers it at a fair price. I have about 6 of them. It is a hang on the outside of the tank box that circulates tank water through it. It would act to let you see poop food etc. And you need no cycle or heater as it uses tank water and filtration for that. This is not for a fish with something contagious. But it works fir to isolate and observe for constipation.
It was originally sold by Marina and it is now Fluval.
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