Here's what a Seachem Representative said when someone had the same question: "Thanks for your questions, and we certainly understand your concerns in using Flourish with your shrimp. All of our products were designed specifically for use in tanks with fish and invertebrates; therefore, when used as directed, Flourish is completely safe for your shrimp, as the copper contained within the product is in a very trace amount. We use Flourish in all of our planted tanks here at Seachem and have no issue whatsoever with any of our shrimp. Hope this helps!". That being said, I wouldn't worry about it.
I've been using Osmocote Plus home brews which are stouter I believe than the Seachem tabs to no ill effect on my shrimp.
It is probably safe.
*edit* Also am recently using liquid Flourish to no deaths yet. But I just began dosing Flourish in addition to Osmocote Tabs.
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