Thank you for the tag
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You're sorta right, some loaches can be pretty aggressive when they have a mind too (when kept in the wrong numbers usually, or other unsuitable conditions), but those are the botid species of loaches you've seen us talking about. Clown loaches, yoyos, ones like that
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And even then, they're usually pretty peaceful, just have a hierarchy in their social groups, so they can scrap and dominate each other, stress each other out if not kept properly in groups of five or more.
Kuhli loaches however are very peaceful, none aggressive fish though
Can you post the photos from yesterday please? The ones you sent to your friend?
That could do it, poor thing. Transferring the water might help him in terms of keeping him in exactly the same water conditions in terms of temp etc, but remember that the water itself isn't "cycled". When we talk about the cycle, we're talking about the beneficial bacteria (BB) which process ammonia and nitrite, turning that into the much less harmful nitrAte. Then we lower the nitrAte levels through water changes.
But those BB don't live in the water column. They live in the filter media (the sponges etc inside your filter), and on the hard surfaces in your tank. On the glass, the decor, and especially the substrate - that becomes a big surface area for BB to live on. But since your set up is new, it's likely mainly the filter media holding all the BB. So while it's okay to move the water with the fish, if it's a different filter, you want to transfer your existing filter media to the new filter to retain your cycle. And keep a close eye on ammonia/nitrite/nitrate levels for a while.
Do you know what kind of filter the new tank has? You can add a pre-filter sponge to the intake of many filters. Will baffle the flow somewhat, be a softer surface if he does get pulled against it, and also acts as additional filter media.