3" female firemouth... i know it sounds rediculous but this aqua nazi has killed both of the husbands ive got her, straight up half-ate 2 fellow tank mates between marriges (lil JD and a com plec)... put her in the 55 with the solo 2.5-3" in red belly pirhana... within 3 minutes shes terrorizing the RBP... now she sits in the 20gal wide with a 2" kenyi!: the only fish she doesnt go Lecter on (who woulda thought).