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I apologize that no one has responded to your question sooner. Different experts come online at various times. I just logged on and saw your question. My name is ***** ***** I’m a biologist with a special interest in fish. I'm sorry to hear of that your fish is sick.
This species is more sensitive than many other fish to water quality, so the first step is to test the water. If you have already done that, please give me the numbers in parts per million (ppm) for ammonia and nitrites. If you don't have a test kit, get one that uses test tubes and chemicals you add to water samples, not the paper strips you dip in the water.
Also, are any other fish in the tank behaving abnormally?
After I have this information, we'll try to figure out how to help your fish.
Thank you for getting back to me. The average life expectancy for the sucker fish (plecostomus) is 10 to 15 years. I feel bad to have to tell you this, but I believe you deserve honesty. Your fish is probably suffering complications of old age, and is nearing the end of his life. If you would like to know how to humanely end his suffering, let me know, and I will give you the best way.