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Discussion Starter · #1 ·
i am thinking about building a bunch of fake rocks for an upcoming project. I have seen a lot of people using this, but there is also a bunch of people that say it is not fish safe.


any idea which is it?
 

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these foams are made of polyurethane. Once, it's cured, it's pretty stable and won't cause harm. UV will break it down though.
 
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