48ish gallon bow--from ugh to ooh (I hope)

[Myka]

I wouldn't go BB with the Mandarin if I were you. He'll likely starve. You can safely change the sand out by siphoning no more than 1/6th of the sand bed out and carefully replacing it with rinsed sand (preferably "live" bagged sand as it doesn't cloud the water near as much) no more than once a week until it's all done. You won't get a spike of anything if you do it this way. Leaving that dirty sandbed in there isn't a good idea either as you'll be fighting phosphates and nitrates (and all the wonderful algaes that accompany such nuisances) forever as the sandbed will never clean itself. A couple orange lipped conches and/or a Tiger Tail cucumber would help the sandbed out.