Can someone tell me whats wrong with my fish

[psilentchild]

My two tangs have been scratching alot lately.My duss has a slight twitch.I have had both since june and they just started within the last few weeks.My parm are fine.My is reading .2 but my ro water is reading .2 also so I dont know if something is wrong with my test kit or not.They both are eating fine.Here are some pics of them both my kole tang would let me get a good picture of him.
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[psilentchild]

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[psilentchild]

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[RBU1]

They have ich. The dark spots are were the parasite was attached and dropped off. The fish could be able to fight it off but it will always be in your system unless you remove the fish. You would have to leave your tank fallow and treat your sick fish in copper.

 

[psilentchild]

Does spots on my duss is on my tank glass not the fish.My kole tanf has lighten up in color.Does any one have and idea?

 

[RBU1]

Yup....Ich