when my 540 arrives that will be my new cichlid tank. my delema is ill have a empty 220. now what im prob gonna do is make a large semi aggressive tank (aro,knife,) things of the like. now in a few stores i have seen vampire tetra. i know they get big, and ive been reading a bit and know they are only semi aggressive(dispite huge teeth) but that they unknowingly die at about 12" anyone know about these fish or have any first hand experience? id like to get one but im not good at losing fish. i would hate to have a fish for a year then have it die out of no where. any info would help.