Do you have any coral? I have the same issue in my 200 gallon system and it has a couple coral in it and I was wondering if the products you are using if they are reef safe.
The OP didn't say anything about using cooper. I have had better luck with CP against velvet not ich. TTM has been the best method for me. In your case you may have to explore with hypo-salinity at 1.009.
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