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Jsalemi, if you want, you can leave the plants in the pots, but the plants won't get enough nutrients this way. This is because the rockwool in the pots has no nutritional value to the plants. Nutrient-rich substrate, or plain gravel full of fish wastes, or plain gravel with plant root tabs, on the other hand, is full of nutrients. The more the roots are exposed to a nutrient-rich medium, the more nutrients the roots are able to absorb, and so - the better the plants grow. I personally always remove my plants from the pots. And they grow just fine. I am also not sure if the plastic pots don't start leaching something into the water after a while, but they probably don't.
P.S. If plant roots start to decay, you need to trim them off. You can't do that with a plant in a plastic pot. The decaying plant root matter can contaminate other plant roots and the substrate itself.
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