Im am sorta new to the technical keeping but I have been doing my research.
I keep several pair of P. Grandis, and I have several different size cages, not all holding gradis though.
Everything you are going to read will say taller is better.
There may be a few times when your gecko is in hunting mode and cruises around the bottom but 99.9% of the time all of mine (2 males, 3 females) are perched out in the open, either on a leaf, bamboo, or the glass.
Roomy bottoms do provide area for plants, and these guys will want stuff for cover.
I am very happy with exo terra glass terrariums for a display set-up. These can be picked up @ reptile shows for pretty cheap, new or used.
The size of cages i use for one very large pair is a 24x18x24 (lxwxh), another smaller pair are in an 18x18x24. I keep a solo female in an equal 18x18x24.
I have some cresteds in 12x12x18s and I dont think the width or height would be enough for a grandis.
