06-04-2008, 12:17 PM
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I do not have experience in using sulfathialoze in treating marine ich. Sulfathiazole is more commonly used to treat secondary bacterial infections. It is very important that you do not mix Sulfathiazole with Copper Sulfate. That being said, lets move on.
You say you have ich, so I will assume you have determined with accuracy that the disease we are treating is in fact Cryptocaryon irritans. If you are not 100% comfortable with this fact, then you need to seek additional assistance before treatment. If you have diagnosed correctly, you should see scattered white spots on the body and fins. You may also see cloudy eyes, scratching behavior, and labored breathing. The fish would likely rub against corals and decorations and swim directly against the water flow of power heads and filter outlets.
As to treatment, you should know that removing infected fish does not rid the aquarium of the infection. You must treat the actual water. Crypto is usually treated with a Copper Sulfate / Malachite Green solution. This treatment option is not available if your aquarium contains live rock or invertebrates. In this case, hypo salinity is usually the most effective treatment. Many hobbyists combine the hypo salinity with a garlic food supplement.
Unfortunately in the marine hobby, it can be very difficult to overcome a case of ich. Far more important than proper treatment of the disease is proper prevention. Many precautions need to be taken to prevent outbreaks.
Never buy fish on first sight. Only purchase fish that you have planned to buy and watched carefully over a period of several days to weeks. If necessary, ask the pet shop to hold the fish for a few days so to ensure it is in good health. Make sure the fish is feeding aggressively and swimming normally.
At home, all fish should be isolated in a separate aquarium for 2 to 3 weeks prior to adding to the main tank, allowing time for any disease to expose itself and be treated. In the display aquarium, I would suggest running a UV Sterilizer to reduce the risk of infections.
Over the long term, selecting proper fish for your size aquarium and experience is extremely important. I am not sure which species of Tang you purchased when you say "Brown" Tang, but a couple species fit. One is the Zebrasoma scopas, which needs a well established tank of at least 75 gallons. The other likely species is the Acanthurus leucosternon, or Powder Brown Tang, which grows very large in size and needs no less than a 125 gallon tank, preferably 180+ gallons. I can not comment on your tank size, but i can say that you made a poor choice in fish. You should never add a Tang to any aquarium which has had a recent Ich outbreak. Tangs are extremely sensitive to Ich and a very poor choice for a newly established aquarium. The Zebrasoma genus is generally hardy, but still not a good beginner choice and certainly requires a quarantine period prior to introduction to the display.
I know this post is running long, but i am afraid that a lot of mistakes have already been made. It will require some effort on your part to fix this and a lot of patience.