Non begginer reptile pet...........................…

OKay so i have a bearded dragon and a leopard gecko right now and i want another reptile i was thinking a crested gecko maybe something that'll fit in a 55 or lower tank maybe a mali uromastyx.And please no one say leopard gecko or beardie i know someones going to see the title and say BEARDED DRAGONS ARE COOLZ or something. but seriously something thattl fit in a 55 or smaller that arent extremely complicated. IDC about what it eats really fruit vegetables mice insects or people. I just need some suggestions.