It looks to be like 5 inches by 8 inches, in comparison to my 2.5 I'd call it a 1.5 gallon. Perfect for a female as is. If the desk were empty of all the little pieces and you snapped on a branch from a silk plant where the plastic one is then I'd say go for it for a male. Nothing like an odd design to bring a tank to focus. Maybe you could find a little plastic desk miniature that would be more suitable.