Would this stuff work underwater?

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As long as there aren't any fish or other inhabitants you could definately use it. Since it is meant for hydroponics and not aquairums, it may or may not be safe with fish. If you want to use it with fish, I'd recommend testing it out before adding it to the main aquarium and risking all your stock.
 
Since they don't appear to be adhesive backed, I'm just trying to figure out what might be potentially toxic.
 
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