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Discussion Starter · #1 ·
do you cement the back of the styro aswell before silicone or not. no one makes it clear?
 

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Most people don't cement the back of thier diy styrofoam background. The silicone sticks very well to the styro and you also avoid scratching the back of your tank.
 

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Discussion Starter · #3 ·
so the styrofoam wont be bad for the fish because its not covered in cement right?
i wanna get this right the first time
 

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Should be fine. Seen a few of these backgrounds and no ill affects from the styrofoam. Good luck on the project.
 
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