So i got 4 silverdollars and 3 pacus and i put them in the pond today. when i went to check on them one hour later all the silver dollars were lifeless on the pond floor but they werent dead cus they couldve still swam. one of them had their eye out of their socket but with it still attached to the skin. I moved two of the silver dollars inside. whats wrong with these fish? the ammonia nitrate and nitrite levels are normal. the pacus are alright though