Your 3" will be ecstatic to have a friend.
I have never seen Weather Loaches give anyone problems.., they are truly a very gentle fish, even with the smallest tetras. I also have them in with Kuhli Loaches, and they seem to enjoy being in eachother's company, regardless of the size difference.
Brown Weather Loaches will also school with the gold or white variety. Weather Loaches are great.., they are one of my favourite kinds of fish. I could go on forever about their attributes. All in all, they are very social and entertaining to watch.
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