How to Clean Water while using Coppersafe?

[Loganfish]

Hello. I am currently using a small dosage of Fritz Coppersafe in my 55 gallon to help quarantine some wild caught fish I brought home, but I’ve realized that there’s some bubbles/foam in the surface. I think this is because of the fact that there’s a decent number of fish in there, which by the way I’m hoping I can rehome some this week, and also because there isn’t plants in there really at the moment. I would like to keep the water clean, but if I do water changes, it’ll remove the Fritz Coppersafe while I’m dosing the tank, where then I’d have to re dose again etc. etc. . The point is, how can I keep the water clean while using the Coppersafe? I have a ton of Duckweed, but idk if Duckweed handles Coppersafe and from past experiences, the light and current on the tank is (the light) low and (the flow) to harsh. Any ideas?

 

[Loganfish]

The foam and stuff

 

[Loganfish]

Also the fish I brought home recently, which were two Striped Shiners, as well as a few Central Stonerollers I brought home a few weeks ago, can carry parasites, especially the Striped Shiners, so I like to add about 4 teaspoons of Fritz’s Coppersafe into the tank so there’s something to help cleanse the parasites and stuff off them. Also the fish I’m wanted to rehome this week if anyone is curious are: 4x Pictus Catfish, 1x Large Blackskirt Tetra, and maybe 1x Four Line Pictus Catfish and 1x Red Jewel Cichlid

 

[Loganfish]

BUMP!

 

[TwoHedWlf]

50% water change, 50% redose.