My Yellow Tank died without any cause!!!

[TOMMY323]

My 35g tank was setup almost 2 years. Monthly water changes. Everything was fine untill yesterday, I looked at my tank on 2'clock (after midnight and light goes off). I saw my Yellow Tang on the sand like a leaf, and it does not swimming. At that time, I think it does not completely died. Because after 30-minutes, I saw it at another place but very near, like it dance. It don't know what happen to it. No disease (no white spot), no water change in a week. Just an ordinary day. I did not do anything to my tank in 2 or 3 days except top off water, but i think the top off water may not a cause.

The following is my detail.
Tank size: 29x15x20
Live rock about 1/4 of Tank size.
Fishes: 1xBlue Damsel, 1xTomato clown fishes, 1xYellow Tang (which was died) They stayed together for a years. No Fighting
Temp. 82-84 everyday (no chiller, no heater) maximum vary is 1C in a day.
ph. 8.2 (Tropic Marine)
NO2 and ammonia = 0 (Tetra)
NO3 around = 5~8ppm (Red Sea)
PO4 less than 0.1ppm (Red Sea)

I leave in Bangkok, Thailand. My friends and LFS suggest that It would be shocked by something else. Is it true?

Any reason to make it died immediately?

 

[TOMMY323]

For more information, before and after Yellow Tang was died, everything in my tank looks just fine. Including all corals which mostly mushroom, and 2 cleaner shrimp are also fine.

 

[npaden]

In my opinion a 35 gallon tank is to small for a Yellow Tang.

Was it fat and happy? All the tangs I've seen in small tanks end up looking pale and thin and stressed from being in so confined.

I'm pretty sure this would shorten their lifespan.

Nathan

 

[JohnD]

Tommy,

What where you feeding the tang? Yellows need a good daily supply of vegetative matter like nori or Seaweed Selects. That might be the problem right there.

 

[TOMMY323]

Was it fat and happy? All the tangs I've seen in small tanks end up looking pale and thin and stressed from being in so confined.

It seem to be fat and healthy, but i'm not sure whether it happy or not.. it seem to be startled often (since I bought it) when I or any people passing in front of the tank. Its color is yellowish, but can notice a little pale on a couples week ago. Is it a symptom for highly stress and lead to death?

What where you feeding the tang? Yellows need a good daily supply of vegetative matter like nori or Seaweed Selects.

They were everyday mostly feed on "Tetra DoroMarin: Sinking Morsels" and "Sera: granulated food" and "Aqualine Magnum FlakeFood" all are dry food. Only twice per month that I feed my yellow tang with "lettuce" and "cabbage" but NO "nori" because it doesn't eat.

Is it my fault to give a wrong food to them for a long time? Can anybody recommend brand name's commercial food that are best for tang?

Thank you very much everyone.

 

[teevee]

The skittishness may have been a result of the rather confined quarters. This combined with the potential dietary issues may have led to the animal's demise.

 

[1937 Waco]

How much salt do you have in the water? Low salt and lead to kidney failure after a few years.

 

[TOMMY323]

SG was maintained around 1.023~1.024 at temp. 27C (or 80.6F) using CoralLife DeepSix Hydrometer. Is it a proper value?

 

[sally1]

A 35 gallon tank? Your tang died of depression. That is too small of a tank to house a tang.

 

[TOMMY323]

Thanks very much for all reply, I sorry and very sad for keep it in bad enviroment.

And one more question, In this case my Yellow Tang is depress or stress or anything else about its health. Is it doesn't always to show the sign like white spot or do not eat food? I've read often that fish will have low tolerance to parasite or bacteria in water when they're sick, depress, stress or something. But my situation, it does not show any sign before it gone. Is it normal?