What medication are you using? The ones I have used in the past all recommend only removing carbon which will absorb the meds as does rock, sand and porous tank decorations, but otherwise definitely continue normal filtration. If this fish has already been in your main tank and it's only symptoms are the cloudy eye and frayed tail, returning it to the DT maybe the best option at this point. That being said, don't give-up on qt'ing or treating fish, as both are a major part of long-term success in this hobby.
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