MV takes a while to kill unlike brook which kills in as little as 48 hrs.Each fish is different and by just feeding them garlic and selcon soaked foods that will boost their immune system to prolong the infestation even fish with MV will take different lengths of time to kill different fish some fish even seem immune to it and don't show any signs. MV can kill 1 fish and leave the others alone till the next batch of eggs hatch and it will be 100 time worse. and that round may kill 3 fish and the next batch of eggs will hatch and produce 100 times more parasites. that is the cycle so it can kill fast but I have seen fish in LFS stores with MV last 1-2 weeks. You just have to know what you are looking at.

Remember people it takes 1 fish to start a cycle and that fish is generally the first to die but not always depends on it immune system. I have seem 1 tank wiped out from MV and to treat it as MV will also cure ICK but is very hard on the fish. ICK looks like flake and MV looks like the fish has been dusted with flower that can range in color from white to black. It is bad and mistaken for many different parasites better to error on the safe side and call it MV and treat it as if it were MV, because the treatment will cure ICK also. If you know it is ICK for sure treat it with FW dips and soak food with garlic and selcon.

If I were closer I would do what ever I could to help. We use to drop an old Pennie in the sump once a month it would keep the copper level up a bit as there is a trace amount in natural sea water and now imitation sea water has trace amounts. This will not help you out any just some old folklore that was used in the hobby many years ago.

I don't remember having so much ICK in LFS tanks back then as I see these day and they sell fish with visible parisites, they should be ashamed.

Bill