Jimmy wrote:

My fishes are breathing heavy.

Quit showing them pr0n. (but really...)

Check ammonia levels, also if the tank is warmer than normal you may
need an air stone...

Can you give us more information to work with?

Tank size
Number of fish
How long has it been running
Ammonia level
Nitrite level
Nitrate level
pH
Temp
Other fish, plants...

-D
--
"There is nothing so strong as gentleness, and there is nothing so
gentle as real strength." St. Francis de Sales