There is a reason most states restrict copper discharge in NDPS permitting to levels less than 20 ppb. Copper is an indiscriminate algaecide and has detrimental effects on some animal enzymes production. Even the chelated copper products eventually result in elemental copper in the water that precipitates as a metal hydroxide salt, but at least the dissociation is controlled and so the impact of over-feed is lessened. What ever you choose, it is always advisable to start slow and add more as needed.
