Definitely think about a divider to start out with if you go straight to a 4x2 as stated. Most retics can handle the upsize in caging, very few can not handle it for some reason tho, that's where your divider and lots of hides/foliage comes in.
I have 1 Male in particular, he absolutely hates a big cage with big open front. Will push, go highly defensive and strike at the cage front when he sees someone walk by. I switched him back into a tub, 56qt and hes 6.5ft, went back to being comfortable and not nearly as defensive. Not telling you this to worry you or anything like that, just telling you from experience and what to look for.
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