Foam or not

[bullit67]

Well I am going to set up my new 300 gallon (72X36X27) marineland tank this week end. And was debating on if I should put a sheet of foam under the tank I didnt with my 265. I was thinking it might help level the tank as the floor drops about 1/8 of an inch as the tank is on an outside wall. What dose every one think and what did you use sheet or weather strip and how thick?