Guys, I have been trying to lower my nitrates for weeks now! Every few days or once a week I lose a fish. Other fish in the tank barely swim, I thought maybe they’re just lazy. I have zero ammonia, nitrites, my ph was low but got a reef buffer and that increased my ph. I am running hyposalinty because my DT has Ich but screw it I purchases copper power and will be dosing my tank once my salinity is up, it’s currently 1.010, I’ll be slowly increasing it. Im pulling my hair because my nitrates will not go down. I replaced my purigen, carbon, was still high. I purchased filters and replaced them and did a 50 gallon water change, total system is 200 gallon and the nitrates still look the same! What in the world is going on?!!!?? This is tick*ng me off! I’ve done multiple water changes with the old filters and now even with the new it’s the same. I use purigen, carbon and these rinseable then eventually replaceable green filter balls from pet o. I see seachem has a de nitrate which looks like some sort of bio pellets. Can someone please suggest how to lower nitrates! Or what to use in my filter canisters?! Please, I’m about to throw my 200 gallon system out, what am I not getting.