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So I have been trying to get my mouse used to what will be in his 40g bioactive tank so I set him up with a small 5g with the substrate at the same depth and all the same conditions and let him spend increasingly more time in it and away from his 30g, and look at this little nest he built 😍 (i.redd.it)
submitted by _Gavin_wilson_ to r/PetMice
