Some collection stations now are starting to put a small piece of filter floss in the bag with leopards wrasses. This way in the bag they try and burry them selves in the floss and not the corner of the bag. Ive seen them come out of Africa, red sea and Sri Lanka like this and the survival rate is much higher. Even at Wholesalers here in Miami, they are always kept with a small amount of sand. If you use dry sand I dont think youd have a problem with a cycle.