rigid foam under tank

[reefwithareefer]

Mine kept on compressing for about a week until it stopped. Then I bought self sticking rubber base (base board) and put it around bottom of tank to trim it out and cover the styrofoam. The rubber base is waterproof and flexible so it is perfect for that application. It is 1.00 a ft and comes in different colors. all depends on your taste...

Ooops, just saw your pic. You bought something different than I thought.