I couldnt remember the exact dimensions.......measured it again and it is 48 long, 24 wide and 30 high. Hope that makes better sense. Trust me he is not thin. The funny thing about these guys is how they eat. I have been feeding him according to some articles on these guys. Dont feed everyday and feed bigger meals every three days or so. After he eats he really looks pudgy. Its pretty funny.2 years old and only 12"? what are you feeding it? those are some really odd tank dimensions (works out to 224gal btw). If he's got good water and enough food not to be stunted he will defo outgrow that. surprised he hasn't already