FYI - products stating that they "remove" heavy metals are lying. They may complex them and precipitate them out from the water column. Fine, they are in the substrate or the filter instead - which is still in the system, and after a few hours to days max, the agent breaks down and the metals are again fully available. Do not believe everything you read on a label. Much of it is branding puffery.
Slime coat additives: Is there somthing wrong with your fish's slime coat? If so it is probably due to bad water conditions, which should not happen, or at least should be corrected. Fish have no difficulty maintaining a fully normal and functional slime coat. Additives to assist this are snake oil, especially as a purported routine and chronic "need" in a heathy tank. A "conditioner" to neutralize disinfectants used by utilities to make the water supply safer is required unless you use "time" - as I do more than 95% of the time.
When my utility-provided water has chloramines, I use Prime. When it is chlorine-only, I use time.
Slime coat additives: Is there somthing wrong with your fish's slime coat? If so it is probably due to bad water conditions, which should not happen, or at least should be corrected. Fish have no difficulty maintaining a fully normal and functional slime coat. Additives to assist this are snake oil, especially as a purported routine and chronic "need" in a heathy tank. A "conditioner" to neutralize disinfectants used by utilities to make the water supply safer is required unless you use "time" - as I do more than 95% of the time.
When my utility-provided water has chloramines, I use Prime. When it is chlorine-only, I use time.