Petco is having a GIANT sale with tanks and I am looking at getting one of the veija species and I've narrowed it down to Zonatus, argentena, or synspilum. Do they roughly all get the same size? I can't decide which one I want!!! But the purpose is for a "show fish" for the living room that will stun guests, cause my wet pet motaguense is upstairs and is seldom visited!