I would take the cricket out. Beings as you have only had the spider for three days it is still probably settling in to its new surroundings. Dont worry about it not eating as they can go for months without eating. Just so long as the abdomen is nice and plump. Make sure it has a water bowl though if its big enough. How big is the spider? If its under 3" then don't give it a water bowl, just mist the side walls of its home every couple of days but don't let the substrate get wet. Take the cricket out and then try again with food in a weeks time.

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