I am currently dealing with an outbreak of ich in my tanks. I have a 75 gallon with 4 tetras and a 2.5 inch blue acara. I had a 4 inch gold severum in there but is now in a 20 gallon temporarily after he showed so aggression to fish I was adding. I quarantined all the fish and checked the parameters everyday. Now they all have ich including the severum in the 20 gallon and tetras/acara in the 75 gallon. I am treating with tetra ick guard and we will see what happens. My other tank which is a 10 gallon has 2 juvenile pearl gouramis. They are in there temporarily but I see one fish has a single white spot. It looks like the ich spots on my other fish but they have had no exposure or cross contamination from the other tanks. Is it possible for ich to cause a single white cyst? Only one of the gouramis has it and it didn't multiply like the others did within a 24 hour period. Am I just paranoid or is it something I should be concerned about?