Try zeomix rock from AF and zeobak and zeostart3 from KZ the best way to reduce nitrate is to eliminate ammonia. No ammonia then no nitrite therefore no nitrate the AF zeo mix rock doesn't need to shake everyday so less maintenance. Zeobak N zeostart3 also reduce ammonia and nitrite. My tank is 400g volume and I don't run GFO or carbon and my nitrate N phosphate are both 0
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