Not to be a downer, but if there is too much ammonia in your tank, your Betta fish will die a horrific death. They may be aging, and sometimes it’s a favorite spot. If your old Betta fish lays or sleeps on the bottom of the aquarium, don’t be alarmed. LOOK FOR CATARACTS – Older Bettas might have them which look like filmy spots inside the eye.An older Betta might be slower and make a couple of passes before eating it. WATCH THEIR FOOD REACTIONS – Older Betta fish will normally swim briskly to food and eat right away.CHECK THEIR SWIMMING HABITS – Adult Bettas will swim around a fish tank with gusto, whereas an old one might hide behind decorations.Many old Betta fish will also lose their desire to flare – fins spread wide and moving back and forth, usually displayed to protect territory but can be seen in mating and for other reasons as well. NOTICE ANY BODY CHANGES – Look to see if your healthy fish has become thinner or has less energy than normal.Young ones have the most brilliant colors, the adults are slightly faded, and the oldest will look muted and mostly diluted. If its fins are tiny, it could be a juvenile or even a baby. CHECK THE FINS – Adult male Betta fish have long, flowing fins.Sometimes it isn’t easy to catch them being still. Use a ruler to see how big they are when they’re near the side of the Betta fish tank. MEASURE YOUR FISH – Adult Bettas are around 3” long, while the kids come in at a smaller size.Observe them and use common sense to figure it out. ![]() Of course, some have lived longer, but this is the average.Īlthough it’s tough to tell how old your Betta fish is, it’s not impossible to get an idea. ![]() The lifespan of a captive Betta fish is 2-4 years.
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