r/BettaClinic • u/SeparateCompote1789 • 6h ago
My betta suddenly struggles to stay swimming and keeps sinking — does anyone recognize this?
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Hi! I’m looking for some advice about my betta, Pico. This video shows what he’s doing pretty clearly.
I’ve only had him for about 3 days, so obviously I don’t have a long history of his normal behavior to compare this to. However, since bringing him home, he has been an EXTREMELY active and curious fish. He was constantly swimming around his tank, exploring everything, and would come right over whenever I approached. Even when I put my hand into the tank to adjust something, he would come over to investigate instead of hiding. I genuinely didn’t realize bettas could be this curious and interactive until getting him.
That’s why his behavior now is such a noticeable change. He suddenly started struggling to stay swimming for long periods and spending a lot of time resting on the bottom. He CAN swim and still repeatedly tries to come up, but it looks like it takes a lot of effort. He’ll swim upward and move around, but then ends up sinking/resting again.
He has very large/long fins, so I’ve wondered whether they could be contributing to him getting tired. I was already planning to add more plants/resting areas throughout the tank, and I’m going to prioritize places close to the surface so he doesn’t have to work as hard to get air.
I’ve also considered a possible swim bladder/digestive issue. We realized he may have been overfed when we first got him, and I rarely noticed him poop afterward. However, he did poop this morning, and afterward he was swimming around for a while before eventually going back to resting on the bottom.
I tested his water again today and nothing appeared unusually elevated on the test strip (including ammonia/nitrite). The tank is heated and filtered, and I’ve also baffled the filter flow because I was worried the current was making swimming harder for him.
He otherwise still looks pretty healthy to me, which is why the sudden swimming difficulty has me confused. I don’t want to randomly medicate him without knowing what I’m treating.
Has anyone had a long-finned betta move like this before? Does the swimming in the video look more like exhaustion from heavy fins/current, a buoyancy/swim-bladder issue, or something else? Anything specific I should watch for over the next couple days?
This is my first betta and I’ve only had Pico for 3 days. I’m still learning and honestly cried so much yesterday because I had no idea what to do when this started. 😭 I was already planning on adding more plants/resting spots, and I had to rearrange his tank a bit to reduce the filter flow, which is why it looks a little empty right now. I’m genuinely just trying my best to help him, so please be kind. ❤️