I have had high nitrate problems for a while in my display tank, and was up to about 100 a couple months ago. While I don't have any fancy corals, my toadstools, colt coral, bubble coral, frogspawn, and some others, all seem to be doing OK. Fish don't seem to care at all, incl some butterflies, and all healthy and eating well (too well, which is part of the problem).
Having said that, I my nitrates are now slowly falling and down to about 40 now. I have started up a bio pellet reactor and also changed my skimmer pump, and that seems to be helping. I was only getting about a cup of skimmate every week, at best, and now get that much pretty well every day.
So I hope to get mine under control soon.
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