Styrofoam help

[spoot]

Which kind of styrofoam were you thinking about? The blue/pink rigid foam insulation sheets aren't much use as they tank does not have enough weight to compress it. I use double layer of high density laminate flooring underlay which is much softer and will actually compress to help level the tank.

If you must use the rigid stuff though, I've used 2 separate sheets on my 75 for 2 years now without a problem. Just try to make sure the gap between the sheets is minimal.