Thanks so much for replying! I had a feeling they were more terrestrial but ive seen my golden mantella climb all the way to the top of his 10 gallon so that got me kinda curious. I think i am goin to proceed with the 30hex, either way there will be more room then in a 10 gal. And considering ive found some prehistoric looking "air ferns" the vertical space would be best. Thanks so much!