sick koi
 

i dont know if this is the correct place to beg for help but one of my koi died 2 days ago and now the pair to it is also dying they just seem to lie on the bottom of the huge tank,outside with just tiny movements of frount fins and mouth movements on its side , i am devistated and ask please for any help before this one dies, the pond is 1000 gal and is 2-5 ft deep.please try and help