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If you are referring to the Pleco, then no. They are a fish and fish use gills to extract oxygen from the water. In poor water conditions you may notice fish staying at the top of the water almost like the are gasping for air, however most species of fish can not take air directly from the...well....air.
Fish do not normally "float around" they swim. If your fish is floating/sinking then it is probably dead.
Dead or dying
Some fish are surface fish and others are not. Without you saying what kind of fish it is that is at the surface it is impossible to say if anything is wrong. BUT! if the fish are breaking the surface and gasping for air, then you have a major water problem and need to do some very large water changes immediately. Otherwise your fish will die.
The swim bladder makes your fish sink so it isn't floating to the top of the tank.If your fish is floating then it might be a swim bladder problem.Or your fish is dying.
The fish is either too full, or ill
Probably because it is gasping for oxygen. You need to do a water change pronto. Failure to act could easily kill the fish.
It was formed by dead fish floating to the top to make an island.
nevermind, she died
Its Dead. When it floats up and the gills are not moving and breathing for sure it is dead
the air symbol is hidden on uptown which is floating in the air on mcworld map the symbol is below the voting polls in the top right corner of the door
Buoyancy is what keeps a boat floating on the top of the water. Buoyancy is what makes a helium balloon float in the air.