Urgent help! What has attacked my fish?

[mahadazad]

Also my tank is under hypo salinity due to ich outbreak its been 45 days now since it is under hypo salinity

 

[Humblefish]

Also my tank is under hypo salinity due to ich outbreak its been 45 days now since it is under hypo salinity

Are you sure the tank is infected with ich, and not velvet: https://www.reef2reef.com/threads/velvet-amyloodinium-ocellatum.217570/

Also, have you been monitoring (and buffering) your pH since dropping the DT down into hypo??

 

[mahadazad]

I am not aware what buffering means. For pH I have ordered the kit to measure it but it has not arrived yet. I am doing water changes 25% per week as suggested by a shop keeper. Also the guy said it doesn’t seem to be velvet to him. So far in 45 days I haven’t seen it attacking the fish

 

[Humblefish]

I am not aware what buffering means. For pH I have ordered the kit to measure it but it has not arrived yet. I am doing water changes 25% per week as suggested by a shop keeper. Also the guy said it doesn’t seem to be velvet to him. So far in 45 days I haven’t seen it attacking the fish

Hypo will lower your pH to an unsafe level, so you will need to periodically "buffer" the water to keep it above 7.8. This can be accomplished by using supplements (available at most LFS) or you can “bake” your own DIY supplement by using baking soda. Spread baking soda onto a clean baking sheet, and bake at 300F for 1 hour. This process drives off water and carbon dioxide from the baking soda, and the result is an effective pH buffer. You will need to experiment (start with a very small amount) to determine how much is needed to raise your pH to the desired level.

 

[mahadazad]

Hypo will lower your pH to an unsafe level, so you will need to periodically "buffer" the water to keep it above 7.8. This can be accomplished by using supplements (available at most LFS) or you can “bake” your own DIY supplement by using baking soda. Spread baking soda onto a clean baking sheet, and bake at 300F for 1 hour. This process drives off water and carbon dioxide from the baking soda, and the result is an effective pH buffer. You will need to experiment (start with a very small amount) to determine how much is needed to raise your pH to the desired level.

Thanks alot for such a great tip

 

[4FordFamily]

I’ve had tangs before that seemed to suffer stroke or heart attack or something suddenly. Those that “recovered” appeared discolored like this for some time before passing shortly after. This is more common in acanthurus tangs but I’ve seen it in Zebrasoma.

I have always wondered the cause, but suspect it high stress or bad collection methods.

How long have you had the fish?

 

[mahadazad]

I’ve had tangs before that seemed to suffer stroke or heart attack or something suddenly. Those that “recovered” appeared discolored like this for some time before passing shortly after. This is more common in acanthurus tangs but I’ve seen it in Zebrasoma.

I have always wondered the cause, but suspect it high stress or bad collection methods.

How long have you had the fish?

About a year

 

[BluewaterLa]

One way or the other I would have to go with poor water quality coupled with Parasitic infestation.
If the tank is undergoing hypo salinity without proper measures to buffer the water and there is no idea of what could be inflicting damage to the fish parasite or bacterial wise then the direct cause would be hard to prove either way.

the only time I have ever seen something like this happen over night quickly with a fish displaying this type of rapid loss of color an almost skin would be from internal , external parasites, bacterial infection OR like mentioned above Poor collection practices.
Though normally a fish will not live more than a few weeks to couple of months after collection using cyanide or other nasty means of poisoning to collect the fish.
One Key indication of cyanide death in a fish would be cloudy eyes.

Was the fish feeding normally the day or night when you cleaned your sump ?