It is definitely possible with minimal harm to livestock.
Pictures as well as specifications of your current set up will help us advise you better on how to proceed.
Also, an rough idea of what kind of planted tank you want to have will be good so that we can advise on how major or how little changes you might need to make.
whether you just want to have simple plants like anubias, java fern or moss versus more demanding plants like Hair Grass, HC or other heavy root feeding plants will cause the set up to differ.
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