I seem to have a problem in my 80cm planted goldfish tank, the fish seem to be taking it in turns to have a fit! which involves zooming around the tank bashing into things, trying to jump out and then laying listlessly on the bottom for about 10mins before carrying on like nothing has happened i've not come accross this in all my years of keeping fish, so if anybody has any ideas what it is and what i can do about it then please help.
I have done a quick water change but it has not helped.
I have done a quick water change but it has not helped.