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It can be used and does work as long as it is used precisely.Thanks for the recommendations
I have copper and have used copper many times . I do have the Hanna checker (big help compared to the liquid kits) and can't deny the results. Even had pretty good luck with Flame angels in copper. The Pharmaceutical grade CP was easy enough for me to get. Pharmacist friend. I prefer the CP for the ease of use and seems pretty easy on most fish in a quarantine setting. A little unpredictable in an aquarium with biological filtration as you are just guessing on biodegradation. But was a easy quick response to save the fish and not hard to remove from the display afterward. The Phosphate levels after the fact will be very high but once the fish are out you can use lithium chloride with no worries instead of a bulk amount of phosphate remover.