YOU should DIP your CORALS !!! LFS just put corals right from the box into there display tanks , SO BE CAREFUL AND DIP ALL CORALS accordingly to the species ..
Coral rx is what I use. I use a cap full in a 1 gallon tank with a power head for 15 mins. I then rinse with fresh saltwater . Add to qt tank for a week if no qt tank add to display . At least you took some prevention. Also inspection and scrubbing might be needed . If I see alage growth I toothbrush it off . Dip and rinse ..
Btw if you happen to see a good crab , inspection , remove the good crab then dip , when your ready to add your coral to your display add the crab to your coral.