I have had two golden severums - both males. My first one was really gentle and wouldn't eat anything. My second one likes to catch guppies, neons, and I suspect even baby bristlenoses (bit crunchy perhaps?). The second one is smaller, and would hide behind plants to stalk the guppies. I now have in with him some gouramis, clown loaches, albino Corydoras, and bristlenoses - all doing well.
My first severum came with three large tank mates - a large silver dollar, large plec, and a synodonis catfish - the sev seemed to consider the dollar his best mate.
Good luck with yours...
Sam