Looking a Reef Savvy when I was look for a tank manufacture to build my tank they make the phantom bottom.
Im pretty sure that the "phantom bottom" that they put in their tanks is the same thing as starboard. There are several manufactures that have pretty much the same thing in the bottom of their tanks. It seems like some sort of thick plastic sheet that they lay down.
Ive seen people (on the internet) go to Sams Club and buy large chef cutting boards and trim them to fit and silicone them to the bottom of their tanks. Its all pretty much the same idea.