Why do my fish swim at the top of the tank after a 10% water change? I have a pump etc and it is only off for a short period while the water is changed.
Hiya
Nothing to worry about, my fish do that too. They probably think that as you are messing about with their tank you are going to feed them as well.
If your tank is cycled and you use de-chlorinated water at a similar temperature there should be no problems. Oxygen is rarely an issue. You don't realy turn off the pump for too long for a water change anyway. Do you have a filter though?
My fish do something similar when I do water changes... my danios come up to swim between my hands when I'm syphoning and all the other fish swim to the bottom in the hope of getting food (all my fish eat from the bottom) and they follow the cories around out of habit The cories follow the syphon and grab anything I stirr up