Does Flourish Comprehensive Supplement affect snails?

[Banafish]

I've been using this for my plants and it says it has got 0.0001% copper sulfate per 1g. Could it be the cause of death for my mystery snails? I had put them in the tank for 2 days and then they died.

 

[Essjay]

No. The amount of copper in that fertiliser is too small to harm snails, unless you grossly overdose it.
I have nerite snails and use Flourish Comprehensive and most of my nerites live for years. A few do not live very long but as they go in the same tank as the long lived ones, it can't be due to anything in the tank.

I have read that snails can be damaged by the store worker. Many of them just rip the snail off the tank glass and this can damage the snail. Maybe this happened to yours?
Or something else in the tank killed them - many medication kill snails and if one was used in the past the tank could still be contaminated.

 

[Banafish]

I have no idea, but thanks! I have only used Flourish Comprehensive Supplement, Flourish Excel (stopped now), prime during water changes, API Quick Start, and api ph up.