What is this red seaweed plant and how fast is it growing? To add seaweed to the mix also distorts the equation. The nitrates were not stable enough anyways. Then you toss in a water change? Its just not consistent enough to see if they help or not. What we need is a tank that has had 20 PPM nitrates for several months on several different or one really reliable test kit. Then no water or feeding changes and add in the mangroves only. Then test again after they have grown some.
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