Mine are about 2 months old right now and still pretty tiny. I am going to move my biggest crestie, Moose, to a 70 gal. tank pretty soon though. Oh, by the way, my crestie that was spending all it's time on the cage floor is climing again. I took out the fake vines and put in some small, broad-leafed live plants and I haven't seen him on the cage floor except to get them crickets! Guess he was kinda picky about the cage furniture. Oh well, like you said .... whatever floats his boat!
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TasiaMay 
~ 0.0.3 dark fire morph cresties - Moose, Kreecher and Lilly
~ Female Yellow Lab - Tasia