Before you add phosphates stop using Kalk and see what happens.
Try to balance the nitrates and phosphates with the foods you add. What type of foods are you feeding? Frozen foods (like mysis) tend to have a better nitrogen to phosphorus ratio than other prepared foods or flake or pellets ie foods that didn't come from the ocean or a lake.
In my case I have to add phosphates because I have to add nitrates. You don't need to add nitrates.
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