I have been buying fish from a vendor for the past 2 years,it seems every other fish or so i get from him are always prone to ich,the problem is he always seems to have what i want(i am a huge S.A.cichlid lover)and in my city these fish are hard to find)my last purchase a week ago has caused an out break of ich throughout my tank!!!I am sooo pissed right now!!!Everytime i address him about this he blames my water,wich i know isnt true because all my other fish are super healthy (i even quartine all my new fish for a week)he has never once tried to make things right,so i am stuck between a rock and a hard place.