Are nitrogen and phosphorus dangerous to fish?I use tropica plant nutrition+ even though i ahve a lot of fish as i need good forground plant growth.Its also included in a fertiliser bag under the roots.I only got the bag and fertiliser liquid a short while ago and after doing w/cs and removing the bag after a co2 crisis, im wondering if they are safe as on the fert liquid at the front it says with a danger sign contains N and P ??
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