My friend had a betta fish he didn't want anymore so I rescued it but it came from a very dirty bowl. I now have it in a bit bigger, cleaner and proper temperature bowl. The fish doesn't do anything. I've had other Betta fish, so has my sister, and they were very active. This one doesn't even move for food. It just rests on its side as if its paralysed. It breathes but nothing else. I can touch it a fair bit and it doesn't seem to notice/care. I'm really worried. He also has a white colour around the area under his gills. What can I do? Is it possible to nurse him back to good health?
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