Moving tank what about the fish?

[haanstang]

So in order to build my new system I have to move my tank. when I move the fish a couple times it will stress them out. So my question. Is there any risk of outbreaks of any kind or anything else due to the stress? If so should I just quarantine all of them? Most of the fish I have had for at least six months others a year. Sum 3 months.
2 clowns - 1 year
1 valentini puffer - 1 year
1 orange Dimond golby - 1 year
1 foxface- over 6 months
YWG & tiger pistol - over 6 months
2 bonded blood fire shrimp - 6 months
1 yellow tang - 3 months
1 scopas tang - 3 months
1 powder brown tang - 3 months
None of the fish have ever shown signs of a disease or parasite. Any help is greatly appreciated.

@Humblefish
@melypr1985

 

[eatbreakfast]

Did you quarantine these fish initially? Did you quarantine anything wet going into the tank? If not, then it is possible parasites are present in the tank.

If they have exposure to parasites and stress compromises their immune system, then it is possible for the fish to face an outbreak.