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Unless you're going to be gone for weeks I wouldn't move them. But if you must I'd get some critter keepers or some square Tupperware type containers with lids, punch small holes in the lids for air, this'll help keep the water from sloshing out or the Betta from jumping out. Maybe get a bigger one that the smaller ones can sit in (don't know how many you need) that way you can heat the one bigger container rather than having to heat multiple containers. Of course you'll need to take your water changing items & food. Hope this makes sense.
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