The Last time I shipped my afro in.. i used a pump from japan thats basically kills most bacteria (the bad ones). the fish had to put in a tank instead of a bag of cos.. but at a costly price.. the pump alone cost mi 600 bucks.. but i have been using the pump for my tanks ever since.. and the fishes are much more lively.. the pump comes from YBM japan.. the pump was actually designed for fish farmers against redtide.. if u r constantly dealing with expensive fish.. that might be wat u need..
