Accidentally Dropped Fish Store Bag in Tank

[jsvand5]

I'm just wondering after how long I can be sure copper will not be a problem ever.

You aren’t going to have to worry about copper. That small amount of fish store water can’t possibly contain enough to have any effect on your system.

 

[WVNed]

I think.
Nothing will happen.
I quite often dump some of the water from bags into my tank.

 

[BeejReef]

Even if there is trace copper, it won't stay in there indefinitely, assuming you do any number of regular water changes. It sounds like a tiny amount. Even if you only did 10% WC a month, it would just be a fractional residual in no time.

 

[PugsAndFish]

Update: Looking ok and everything looks fine so far. Still going to run carbon and polyfilter for a few days though