Ok, I don't know what's going on but I know these things: My bristlenose pleco occasionally rests on his back without suckering onto anything and he is very healthy and happy. He will go for up to two weeks without food when he is guarding eggs and newly hatched fry. My bristlenose catfish (I still have the original two) are the only fish that survived my inexperienced mistakes as a novice and every disease that has ever come into contact with my tank waters,hence they are incredibly hardy little troopers. My oldest are now at least three years old and and I expect them to live for years to come.
Who else lives in your tank? Have you recently added anything ie. plants, fish, decor? Could he have been attacked by other inhabitants?
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