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I have the cheap black plastic. I have can of blue spray paint waiting for when I tackle that, but ....
I am going with a wall of GSP
I’m new here...what the heck is GSP?
green star polyp coral. Here is a picture of @Lasse tank where he used GSP on the back wall. In addition to locking up NO3 and PO4, thus being part of the filtration, it provides a soft lushness to the eye.
It's an out of the box approach to the back wall.
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