Originally Posted by SaltwaterNuB
What's MV? Sorry to hear that.
MV=Marine Velvet...might be the same thing, it just usually kills quick. The copper should help if the fish live long enough. Hypo does not touch MV, so this is basically the only option. Just too bad its going on in a DT. Make sure you watch the levels and try to keep your parameters pristine.
In my case, its a good example of why fish should be QT'd prior to going into a DT. I gave up my usual QT for my son's science fair project (hermit crabs). I get a good deal on a fish and decide i will just put it into my DT and get another QT later. My QT fish never come down with anything. Of course, that fish has MV. About $100 later in dead fish, plus starting a tank over (new sand, rock, etc)...all over a $10 tank. Doing a permanent QT from now on.