Just a quick answer, UV
will not kill your pods
, it kills water born "everything" but not pods
, worms or whatever you have that is not floating in the water are fine with UV
I kept a PBT, purple tang, Hippo tang and yellow tang from 5 to 8 years. I lost them all in the black out back in August. There are many great suggestions already given but I would like to add a bit more just to help.
Let's assume you pick out a healthy tang from your LFS
. It is healthy, round belly, clear eye, normal breath rate, no visible wounds, clear fins and etc, etc... Let's assume you acclimate the fish very well!!!!! It is in your tank and it is in hiding and you shut off the light to reduce stress and now the tang is hiding in the rock work and the tank is dark.
The next day, you are very exciting to go and see your fish, it is shy and still kinda hiding but would take a peek here and there. You are all happy and try to feed it food but it is not eating. THIS IS NORMAL!!! A new fish would take up to a week before feeding in your tank so you should stay put.
Mmm... tangs have no scales. They are very sensitive/hyper fish when in a community tank so usually hobbyists will find their fish infected with ich because they get nervous. At this point, a lot of us would over react and said" WTF, what should I do, the fish is sick and it will get all my fish sick!!", if at this point the fish is active, out in the open and feeding, you really have nothing to worry about. Far too often people would try to do whatever they can to find remedies or try to get the fish out for treatment. This actually further stress the tank/fish and then cause fish or whatever fatality.
My experience is to stay put if the fish is eating. DO NOT FURTHER STRESS THE FISH!!! Con't to feed the fish PLENTY of veggie like nori, formula 2, frozen food soaked in Selcon, Vita Chem, Garlic Extract or other food additive BUT the most important of all, feed spirulina!!!
If you tang is infected with ich but it is eating, spirulina would help to eradicate the ich. Other additives would help to build the fish's immune system especially those with amino acid and vitamine C. IF the fish is eating, then this is the route I would go instead of trying to catch the fish or treat the tank with medication.
So this is my experience. 1) do not jump into conclusion and think that this is the end of the world. 2) do not start to assume that your water is bad and try to do crazy water changes which would disturb the water parameter and cause stress to the fish. 3) make sure that you have plenty of veggie food for your fish like nori. 4) This is again from my past experience, feed your tang flake food. DO NOT OVERFEED as when adding excessive flake food in your tank could cause excessive nutrients and problem algae growth. But my experience is that flake food has very high nutritional value and this would help your fish remain healthy especially when introduced to the new environment.
is a good addition although many would think otherwise. I use UV
personally and would always use it as long as I have a tank. BUT, UV
is not the answer and there a lot more one needs to look into. Overall, I believe keeping a healthy, stable and well maintained environment are the ways to go and this can only be accomplished by one's effort and willingness to learn.