Hey thats mine, or at least it was They will prefer the height over floorspace.

Yeah I know, but I wanted slightly more floor space than my current tank would have on its side, because then I will have more room for a small tree, or something

I'm curious to know why you feed in a seperate tank.You don't need to do that with crested geckos.It also is too much stress to take them out of their tank too often.Geckos are not like snakes that could eat each other if holding on to the same meal (geckos don't do so anyway).
I see no reason to feed geckos in a seperate tank.

I feed my crestie in a seperate tank as well. My reason is I can easily keep track of how many my little guy eats and I dont have to worry about searching for dead crix . He isnt terribly stressed by this either.

My crestie doesnt get stressed from feedings in a seperate tank. The reason I feed, is like mshrmheadcharge said, easy to keep count of how many are eaten, and no dead crickets. Also, they cant hide and are easier for my gecko to catch. And most importantly, she cant ingest any of the bed a beast.