is it normal for plecos to ump to the surface catching a bubble air and then go back to the bottom?
There’s absolutely nothing wrong here. Plecos breathe air and often are seen going up to take gulps of air.
I’ve always thought and heard that like other catfish, plecos breathe air and will take breathes from the top of the tank. Every pleco I’ve ever had had shown this behaviorthe OP has failed to mention he also has puffers gasping for air as just stumbled onto the thread. so it solidified my comment about the water needing aeration. It’s an oxygenation issue- and NO its not normal for plecos- cories yes, plecos no.
I’ve always thought and heard that like other catfish, plecos breathe air and will take breathes from the top of the tank. Every pleco I’ve ever had had shown this behavior