Use of a quarantine/isolation tank is very helpful in these situtaions.It doesn't have to be a stark BB tank.I keep a 30G breeder with a DSB,some softies and zoos set up all the time.I use 2 NO bulbs over it and a powerhead.Nothing fancy.I put my new fish in their to monitor their health and eating habits.It also gives them a place to eat in peace and build up their strength and,it gets them used to my activity and the fact that I supply the food.The fish is easy to remove if it needs to be medicated,but the isolation tank gives it a more natural setting.The DSB is for certain wrasses that bury themselves in the sand to sleep.