You want to start off using only a little bit like 1/8 a teaspoon and up it slowly. This should not hurt your fish as long as you do it right. You can stay with a dose of 1/8 to 2/8 a teaspoon every two weeks or every water change.
Warning: This will cause crazy growth and cause your plants to look beautiful and lush. I use for my amazon sword plants. I posted a video below to show them.
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