I just did something like that at the office. I had 300 lbs of very fine Argo sugar sand (Home Depot Stuff) that I wasn't wild about for the tank. I pulled about 150 out and added it to my sump. I replaced it with 140 of crushed coral. I washed the heck out of it and tried not to make a mess while adding. The tank clouded up for a day. Probably not too much worse than cleaning the sand while doing a water change. No significant problems or deaths.
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300 Reef; 325LR, 1/2" sand bed in tank, 3" sand bed in 215 gal sump/refugium and Berliner PowerPro SS twin becket skimmer. 210 Reef; with 225 lbs of LR, 300 lb DSB, Large W/D and Jebo 520 skimmer modified to accept a becket. 90 RR FOWLR; tied into the 300's sump with a closed loop for extra circulation. 55 hospital. |