I looked at your signature at the bottom of your post...you have only kept timors, beardies, and bps....not very complex herps to keep....a mellers chameleon is a VERY advanced species that is very hard to care for due to how easily it stresses and the necesity of a mate(if you get a male).
Chameleons in general are VERY advanced species of lizards...they are all picky, but the Mellers chameleon ranks as one of the hardest chameleons to sucessfully maintian in captivity. I HIGHLY reccomed you start off with something more like a veiled or a panther chameleon...they are considered begginer species, but are still harder to keep than your typical lizard. Then work your way up the ladder to other interesting species, quadriconis, oustallets and such...it will take LOTS of experience in chams before you would be able to maintain these beautiful creatures.
If you are hell bent on getting a mellers chameleon then make sure you so your friggin research! Dont think you can just guess at what they need...Like nick said visit the melleri discovery page...there is a forum you can post questions on and you can email plenty of mellers keepers and you can ask for their advice.
I have kept mellers chameleons myself after 4 years with panther chameleons...this did not even begin to prepare me for what i was getting myself into! Luckily i got an LTC female who was tame as can be! But dont think your luck will be as good as mine was!
Talk to some people, email Nick at first choice reptiles...he imports them so i think he might know a thing or 2 about them! Post questions if you have any..i am willing to share my tips and others here will too.
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eric