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Hi all I have a 200ltr tank with 30kg of live rock a fluval 305 filter. I have 1 porky puffer, 1 dog face, 2 cardinals, 1 scooter blenny, 1 bird nosed wrasse, 1 tassled file fish, 1 green mandrin, 1 wet morella and a red knobbed star fish. all has been fine BUT my nitrate levels are off the...