I have a saltwater reef tank. It's fairly new just about four or five months. I just added my first coral frag and my wife without telling me added a blue starfish. The nitrates have spiked to almost 20ppm. But my nitrites are at 0. And my ammonia is close to 0 if not 0. I just added some prime to it. What should I do? I'm thinking a water change tomorrow after work.