Mardel's Coppersafe (?) should be maintained at 1.5 - 2.0 ppm for 2 weeks in a proper quarantine tank. Do not use for one month, it will be too harmful for the fish. Be sure the copper is tested daily and be sure you watch the water quality and do water changes as needed. No carbon, substrate, rock or anything else that may interfere with the copper concentration.
Cheers
Steve