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Message: <blockquote data-quote="Hamburglar" data-source="post: 43238" data-attributes="member: 3702">Another question I'd like to ask is how to know when a tarantula becomes an adult. Right now my T is about 4". I asked the guy at petco how old it was and he said probably about 6 months. I asked him if he'd ever kept a T before and he said no, so I don't know if I really trust his opinion. He also really tried to get me to buy a heat mat. I told him that my room stays a comfortable temperature so I think it'll be fine. He kind of laughed at me and told me that unless I keep my room between 78-80 degrees F at night then I should get a heat mat. I know from researching on this forum and others that a heat mat is unnecessary and possibly even harmful for a T.[/I]</blockquote>