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I have three big pieces of GSP that I'm willing to trade or sale for corals or fishes! Let me know what you have to offer! 
https://vimeo.com/136138364
Pieces will be 2"x"2- 2"-3" inches just about $50 or better offer
https://vimeo.com/136138364 Pieces will be 2"x"2- 2"-3" inches just about $50 or better offer