Hi all. I have recently started my reef. I have a forty breeder with LR and LS. The LS that I have in the tank now is from a 20lb. bag of the live stuff that's sold in the vacuumed bags a the local PS. The tank has been up now for five months and thank goodness no problems. However I continue to read about folks that set up there reefs with a deep sand bed. I read about the benefits of gas exchange with this type of set up. I would like some help with this theory. In any event I have 25lbs. of extra ESV sand ready to add. I would also like some feed back on how to add this extra sand into the tank i.e.: rinse 5 to7lbs. at a time and add or rinse half or more.