due to stress yes, sometimes fish wont eat for a while. plecos are nocturnal, they do most their eating at night, so you probably dont see when it eats. now, the problem is, non of your tanks are big enough to home a common pleco, they get 18-24 inches, and rather fast. you should return this fish and get a pleco more suitable for your tanks, such as bristlenose, rubbernose, bulldog...
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