Fish Swimming At The Top Of Tank

[savrocca]

Hi, for the last few days all the fish in my community tank have been swimming at the top pf the tank. With their mouths almost at the water line. Besides this they seem fine. Why are the fish doing this?

 

[trout750]

You will probably fine that due to the hot wheather your tank might be lacking in oxygen, if you havnt done so already position your outlet pipe from your filter half submerged so as to break the water and create more oxygen or if you have a spraybar fitted position above waterline.
or maybee put an airstone in.
also have you tested your water for high concentrations of ammonia or nitrite.

 

[McMurray]

just what i was going to say