I assume that you can break apart the plant at the roots and it'll be fine because that has happened to several of my java fern plants while setting up or moving stuff in the tank. Im not sure if you know but, java fern sprouts baby plants from the tips of the larger leaves. I have some plants are small as a golf ball and they're still making baby plants. You'll see some brown fuzzy roots at the tip of a leaf and slowly little leaves will emerge from that.
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