Ich advice

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125 gallon +25 gallon sump. tank is about 9 months old. Did fine until a week or so ago. Couple of mid sized tangs, clowns, an angel, hawkfish, reef friendly star, cleaner shrimp, anemone, etc. developed ich a weekish ago. Did a 20% water change. Started treating with Kordon ich attack. But not before I lost 2 cardinal fish and two other small angels. Was treating with 1/3 cup of Kordons. Just upped it to 1/2 cup

Water was cloudy (bacteria bloom) which got under control pretty quickly. Turned off my protein skimmer. Local saltwater store recommended against doing another water change until I was done treating. Ich has slowly gotten getter.

My question is should I do another water change and risk stressing the fish more than necessary?

 

[Fish Fan]

Could you post some clear pics or a short YouTube video of the fish for confirmation? Please use bright white light, with no blues, for clarity.

If it's Ich, treating with copper would be a better option than the Kordel product.

 

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white lights, best I could get. The Sailfin shows ich the most. Better than he was.