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I change 50% water once a day and 'hoover' the bottom twice a day with a turkey baster. they are in a small 8" x 5" x 4" tank with just an airstone in it.
If they could get worn out by being peered at with a magnifying glass they'd have been long gone
I will try and get some pics, but they are soooooooooo small and the little tank is plastic so maybe not very good to take pics through, but I will try tomorrow.