40 Gallon Tank Do my goldfish have ich?

EK10

I have a 40 gallon tank that came with two goldfish when we bought our house. Six days ago, after a year and half, I added two more goldfish. After a couple days, the two original goldfish were covered in white dots. Is this ich? Their behavior still seems normal. Also, one of the new fish started out all orange and has been turning dark purple/brown. I brought a photo to the store where I bought the new fish and the guy said it didn’t look like any disease he’s ever seen. I appreciate any advice!
 

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jtjgg

i believe it is ich. also has fin rot.

did you quarantine the new fish before adding to the tank?

also, those are single tail goldfish, they need a minimum of 20g per fish.

the dark spots are most likely due to ammonia burns.

please fill out the emergency template we need to know ammonia, nitrite, nitrate, pH levels in the tank. how often are water changes and how much water is changed, etc
 

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