What size carpet?

[SpyroSkylander]

So I've been told to take out the sand from Spyro's viv, which I have decided to do as it is getting everywhere and I'm sick of cleaning it evvvvery dayyyy. So I have a 36"x18" vivarium and the carpet is based on how many gallons your tank is. So what size carpet would I need? Advice please?

 

[JCuratola]

The pet store i went to only have 55 gallon left so i got that but it was too narrow so i have 2 carpets.

 

[Kaiser]

36" x 18" is the length and width of any of the following vivarium gallon sizes: 30 gallon (breeder), 40 gallon (breeder), 50 gallon, or a 65 gallon. Get the appropriately sized carpet for any of these sizes, as they all have the same length and width, and only differ by height (which doesn't factor into the carpet area).