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I'm not an expert but it seems to me you are exposing the fish to a lot of 100 % water changes. Also if you don't clean your filter totally but you will kill the bacteria the illness will still be in the filter. I'd also be concerned with the chemicals killing your plants.

I dealt with a columnaris early on in my guppy raising days and I found the best thing to kill illness in my tank was a UV filter. You can get them at Petsmart or Petco.

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