Salt Water Fish Has A Powdery/flour Like Substance On Body

[ssssg]

Hello I am new and have a problem taking place in my saltwater tank. It appears that my saltwater fish, 2 clowns and yellow tang have this powdery, flour type substance on their bodies along with now ICH that came about on Wednesday evening. I had a flaming angel that this took hold of and died yesterday. To retrace my steps and sorry for the long email. I purchased a regal tang and flaming angel on Sunday. The yellow tang did not take to kindly to the regal tang and beat it up. I though aside from the beating it looked like it had contracted ICH, so I purchased a hamster ball and placed the yellow tang in that so the regal could recover never did, it died that day. Due to me treating with "Wardly" Ich medicine I did a water change and replaced the filter Wednesday. Yesterday, I had the water tested and everything was normal except the PH was a little low. 7.9 Purchased some Kent product. Temp is about 79 degrees. I also bought a "wrasse" last night at the stores advise instead of the ICH medicne. Any assistance will be greatly appreciated. Could it be the water? I changed it tested ok, Filter? I also put crushed coral in Sunday. Again water appears to be ok except PH. Thanks

 

[WILDER]

White spot looks like grains of salt on a fish, your description sounds more like velvet, as velvet can show its self in a fine dusting of talc appearance.

 

[WILDER]

Can you load a pic up so we all can take a look.