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the grey or whiteish side is the side with polyp ( this side up). try to protect to purple with open water or rock being exposed may attract many issues..
 

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Discussion Starter · #5 ·
I wasn't sure. Pictures showed it with the purple side up, but it looked like the grey side should be up. I have it with the purple side up now and will see how it goes.
 

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There are a few variations of GSP. The best way to tell what side goes up is by what side has bumps. The side that has bumps goes up. The side that is more smooth goes down.
 
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