You can always put a netting over the vacumme that has bigger holes so the dirt and grim go throught without the shrimps. The fabric store sells the netting and it comes in different colors and is really cheap so you could get the smallest peice of it that they will sell you. I do not vacumme my tanks. I have pool filter sand and everthing just settles on the top and I just use a net to get the stuff.
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