/www.google.co.uk/search?num=10&hl=en&site=imghp&tbm=isch&source=hp&biw=1080&bih=635&q=silver+cichlid+with+black+stripe&oq=silver+cichlid+with+black+stripe&gs_l=img.3...1144.8013.0.8241.32.12.0.18.4.3.865.3372.1j0j2j2j0j2j1.8.0...0.0...1ac.1.NGnC8GMl8LIThat covers just about half the cichlid family then...
In that case I'd have a look around for fish that you can research. Start by looking into what you already have & what you can find for certain are compatible tankmates. I reckon guessing could lead to injured, stressed & even dead fish.sorry don't know much about it. so it like looking for a needle in a haystack.
Just wanted to know about it aggression? as i have other some south american cichlids