i wash a little bit of sand at a time in a bucket and grind handfuls against itself in my hands. i spend a lot of time doing this and old sand ends up looking new when you're done. It seems that a lot of detritus is not only mixed with the sand but stuck to it as well.
your hands will be palmolive smooth afterwards too lol.
also thermometers are not always accurate even if they're consistent. i'd test temps in both tanks with the same one to make sure you're not stressing the livestock too much.
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