Stargazers have big mouths so anything small is lunch. You need a deep sandbed for them to live in as well. The electrical jolt is no joke either, it could put a serious hurting on you and even more to your fish.
depending on the species, the one that looks most similar to the pics on SWF.com get to up to 17.5 inches long which is big enough to eat most of your fish and i didnt even look to see how big your tank was.