I am new to cresties and have been researching for quite some time. I plan on getting a 10 week old from pangeara and am unsure on the size enclosure I should keep him in. I have heard many say that a large kk work well at what age should I upgrade the size of the tank? Would a 12x12x18 be a better option until the gecko is about 6 months or big enough to move into a 18x18x36? Also should I wait to do a bioactive Vivarium until the gecko baby is adult size?

I would really appreciate some help, Iíve read many forums and watched many videos but it seems like a very opinion based choice.