So I don't know if this is a problem or not, I have always had undetectable nitrates, but I have had elevated phosphates and the algae problem that goes with it. With hard work I've brought my phosphate level down(and algae along with it), but I've still never seen a raise in my nitrates. Looking at testing sites that seems like a good thing, but I've seen posts that nitrates are needed for softy and SPS coral. Is this true? My phosphate is down to 0.025 and I just did a 20g water change today(130g system). I know softies will suck some of that up. Should I be trying to get my nitrates up? Should I also keep a small amount of phosphate for my softies to eat?