Marine velvet is a serious decease stress does not bring it on it has to be introduced in to the tank and can take a week or even 2 before it shows it ugly head, you can only get rid of it by removing the fish and letting the tank go fa-low for 3 months treat the fish with copper safe as copper is the only thing that will kill MV.... ICK on the other hand is present in most fish and can be kick started by stress. Easaly treated with Extreem garlic and selcon soaked flake food for a few days to a week. I think you should start reading more marine aquarium information before jumping in to a thread and making claims.

Bill