Help, Should I Try To Separate Root Ball?

Hello, I recently harvested a runt. I grow in hydro and I have another plant that needs another 2 weeks. The two plants made a massive root ball. Will it be ok to leave the harvested plants roots in the basin, or will it rot, meaning I need to try to cut it away? The harvested plant stalk is cut about 2 inches above the basin.
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I would remove what you can. Gently pull apart and cut tangled roots apart. Cutting some live root won't hurt the plant. Leaving some of the old root won't be a disaster.
 
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