[Lupin]

Hi and welcome,

Not that I want to go off topic, but the UG filter is useless. Let alone having goldfish as big poopers. The UG filter will never remove the wastes out of your tank. It's best that you switch to internal or external filters although external filters would be your best bet.
Your goldfish seem to be reacting to the meds causing red streaks on their fins considering you use too many meds. If I were you, pls stop the treatments as they are probably getting stressed.
You're also using salts unnecessarily. Pls stop the salt until necessary. Best to use them against ich.

 

[Lupin]

How did you come up to the conclusion that it's ulcer? Are there any other symptoms? Pls post more details re the symptoms or condition. Septicemia is also a possibility.

 

[Lupin]

You took the lfs advice?
Pls be aware that they're putting you into trouble.

Pls read this link:
http://www.fishdoctor.info/fishdoctor/ref.html
There are descriptions re the ulcers and septicemia. I'd say your goldfish is suffering from septicemia.

 

[Lupin]

Your fish's immune system is still probably working. It'll succumb only when it no longer can fight the disease.

 

[Lupin]

Put the sick fish in your hospital tank immediately. And use the Jungle Eliminator. Then try to use activated carbon on the filter to remove the meds in your main tank.
Septicemia can be spread via cannibalism, fecal contamination, etc. It's best to perform water changes and gravel vacuuming to at least eliminate any possible contaminants.

 

[Lupin]

There's a cheaper way. Your goldfish still needs a filter.
Just buy a sponge filter, then connect the tubing on the airpump, then the other end to the sponge filter.
It has two good uses:
1. Cleans your tank. Though you still need to carry out water changes.
2. It can produce water movements so it should produce sufficient oxygen.