That measurement you gave is for a 50 gallon tank - there is a tank conversion table on the right side of this page if you scroll down you will find it --- fyi for next time --I am sorry I dont have a link for a tank that size-- they are hard to find or so it seems --- I would check FB marketplace and craigslist -- I just checked pet smart and they have a tank on there now for $179 for a 50 gallon - same measurements you gave me -- https://www.google.com/shopping/product/15998443127545651275?lsf=seller:8064,store:6455035858067833992&q=Exo-Terra®+Natural+Terrarium+Reptile+Habitat+36x18x18.&hl=en&lsft=utm_source:google,utm_term:5290937,utm_mediumLA,utm_content:GSC+-+Medium+-+Specialty+-+Reptile+-+LIA+Only+%7C+*Catch+All,utm_campaign: try this link and see what comes up
Karrie