Some what beginner here: If my nitrates reach 20 ppm. Should i just feed a bit less to get them down? Would these levels be dangerous to corals/fish?
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Tank looks quite new . I'd just do a 20% water change weekly and keep an eye on them . What do you test nitrate with ?
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Feeding less or water change will help lower nitrates. 20ppm isn’t necessarily bad. I run my tank 15-20ppm. But I think once you start going over 20 you can start running into issues.