Heres my QT tank and Thanks now I"ve got more learning to do lol
The fish comes into the LFS in medicated water they transfer to their tank. If I put in my QT tank and it shows no signs of sickness why should I medicate it more.
I thought I would elaborate on this question. Most of the time the medicated water that the animal is shipped in is actually very low dose copper, and often the LFS will use low dose copper as well.
Copper in low doses, cannot kill anything but what it is really good at is
masking symptoms of a disease the animal has. So if you take the animal and put it in water with no copper, then the disease will reproduce back up to symptom causing levels.
Furthermore, many many diseases have silent periods. In all actuality, almost all do save for the most lethal. The reason for this is actually a survival mechanism for the pathogen. If most diseases
immediatley became symptomatic, then the disease would be irradicated very quickly. By evolving over the years through mutations to have these silent periods, and to give host organisms a way to carry the pathogen without being symptomatic, it increases its chances of being spread, therefore increasing its chances of surviving. Some of the most prolific, and dangerous, human diseases are the ones with the longest incubation periods and latency abilities.
Lastly, a survival mechanism of most animals is to delay symptoms as long as possible. In the wild, an animal who looks sick or distressed or weak, becomes lunch. Predators are opportunistic and in order to save energy they will go for the weakest target they can find. So with this in mind, once an animal starts becoming symptomatic, they are often too far gone to save since they have likely had the disease for a very long time and have just not shown any symptoms for survival reasons. In the references below, there is a link about it, and although its specific to birds, it can be applied to any prey animal.
So, in short, any fish you get assume it has a disease.
references:
http://www.ridgewoodvet.com/services/avian-care/sick-birds-hide-symptoms
http://www.reefkeeping.com/issues/2003-08/sp/
http://www.nature.com/ncomms/2015/150116/ncomms7101/full/ncomms7101.html
http://evolution.berkeley.edu/evolibrary/news/071201_adenovirus
https://en.wikipedia.org/wiki/Asymptomatic_carrier