red snakeheads sick

[Reno159]

Hi I have a pond with red snakeheads in it and 2 weeks ago 1 died. Just today another 1 died. I noticed they look very yellowish green. Is this some kind of disease? Since they're in a pond its hard to examine they for disease. I try to keep the temp high enough to prevent ick and they only eat frozen fish. any help would be greatly appreciated

 

[Reno159]

nobody has any input? Im taking my water in for testing today and will post the results later.

 

[Reno159]

water tested fine so i dunno what it could be. I did give them some goldfish as a treat. Would that kill one instantly and the other 2 weeks later?

 

[Oddball]

How large are the SHs? What's the pond temp? How large is the pond? How many SHs are in it? What tankmates? And, post pics since diagnosing with this meager description will be nearly impossible.

 

[Reno159]

SH are around 2-3 feet, water temp is 85. I had 5 but now only 3 remain with no other tankmates. The pond is roughly 500 gal. Ill try n snap a pic