Styrofoam Under tank???

[RedCoralEdmonton]

Ya I figured from your description that it might have been, there is no center bracing on the top and bottom as well, the plastic peeling is no big issue, you can take it off and re silicone it or just stick some glue in there to stick it back on....as long as your silicone in the tank is in good condition you should be fine!

Steve