About a week ago, I put in my small silver aro in the pond with some of the miscellaneous fish i have. When i checked it today, i saw it had ich because small white spots appered. I chekced my other fish and all were doing well except one of the pacus i had for a while now... about a month ago i also lost the oscar becuase of the ich. how do my 500 gallon pond for ich. I tried using Rid-Ich, but it didnt seem to do anything for my oscar.