rigid foam under tank

[Myka]

Ah ok, I wasn't sure which you ended up using. I think thinner stuff might compress a bit more for you if you think there is still a bit of a gap.

[Bodasifa]

gonna leave it a day or so with water in it to see how it goes. I think if i used the high density pink or blue foam from home depot, it would not have compressed. this stuff is nice and soft

[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.

[Bodasifa]

Originally Posted by 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...

i will definitely look into that, as the styrofoam dosent look too bad but would still like to cover it up

[reefwithareefer]

I also bought black corrugated plastic and put it on top of styrofoam so that my tank bottom was black to match sand color, that way if the sand moved and exposed the foam, you could not see the color of the styrofoam. Again all depends on what you are doing...

[Doug]

Originally Posted by reefwithareefer

Blue or pink rigid may be too rigid. That type is quite dense and not reallyeant to compress. Home Depot sells a 1/2" foil backed, white, popcorn styrofoam that is less rigid. I used it under my 180 and 300 gal tanks. Comes in a 2ft x 8ft sheet

Thats correct. I remember reading a tank builders thread on it, that suggested using only the white for the reasons mentioned here. That being said, I once used pink and it seemed fine but mostly the white and use some type of black edging material.