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Hello everyone. I need your help regarding my bettas fin damage. I have him for almost a month (my first time having a pet fish) and a few days before I discoveres that his fins and ripping, he lives in a Deco O 20L tank with heater and filter. I've been checking the temperature and water quality but still the damage is getting worse. Is it fin rot?
![Plant Fish Terrestrial plant Marine biology Underwater]()
