First, I don't think any behavior is unusual for a loach. They are strange and entertaining creatures. Second, We need more info about the tank (size, substrate, all inhabitants, lighting, filtration, decor, ph (now and when your friend had the tank).
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For in much wisdom [is] much grief: and he that increaseth knowledge increaseth sorrow.
Member of the AGA (Aquatic Gardner's Association)
Member of the IBC (International Betta Congress)
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