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The amount the plants contribute depends on how much they grow. They incorporate nitrogen and phosphorus into their tissues. Harvesting the plants removes those nutrients. I wouldn't remove all the plants... that's like killing the goose that lays the golden eggs.
One warning... if the plants are Caulerpa species, they have a tendency to "go sexual" after a while. That can wipe out a tank if there's a lot in there. Other types of plants are safer.
By the way, DgenR8 and ahhdui are right. If you were to do it over again, there are much better methods than UGF & crushed coral. Given that you apparently have a working system, however, my inclination is to let it be.
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Stuart
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