That's wild man! Every sev I've seen has been really mellow! However, fish are as individual as you and I, so I guess you have some feisty ones!my 5 severums are probably the most aggressive cichlids i have..and i have oscars, jags, JD's, GT's..etc..
i have one large male who will chase my peacock bass all over the place..luckily they're too fast for him..
if you put anything with this GT, keep an eye on them..