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That's a pretty hard question to answer for every situation. If your local water has all the trace minerals the plants need and your fish are making enough nitrates I'd say no. That being said that's kinda like a bit of a hard mark to hit. I feel without ferts u will always be a building block short. This will give algae an advantage cause it can use a wide variety of things as food. It only needs one nutrient where a full on plant will be waiting on 3-5 to be present at once.

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