Redcap - Sick or what?

I don't suppose you have a test kit? It would help alot to know your ammonia, nitrite and nitrate readings. I'm not sure exactly what could be wrong with your fish. But given that you have so many goldfish, it could be a water quality or stunting issue.

It is the opinon of many on this forum, myself included, that goldfish need around 30 gallons each. As they are extremely messy and grow to quite a considerable size. What sort of filtration are you running on your tank? It doesn't sound like a fungal problem to me, so the fungus medicine probably isn't helping much, and is likely just stressing the fish. Same deal with the salt. Did you start dosing salt before or after the fish became sick?

As for the shark (of any variety). They are tropical fish, goldfish are coldwater fish. Thus the two have very different needs. Add to that the fact that you have too many fish already and a shark is a definite, resounding no.

Hopefully others may more of an idea of what may be wrong with your fish.

Bottom sitting is usually a sign of a bacterial disease, and i agree you have too many fish so the filter wont be coping and you may not be doing enough in water changes and gravel vacs

This is the same thing that is happening with my calico fantail. At first we thought it was a raised brown spot on his tail, but it has since turned into a red vein like pattern. He sitting on the bottom of the tank and only comes up for food. He was in a 55 gal tank with two other goldfish (they are all very tiny, about an inch and a half or smaller), but then he developed a few ich spots so we took him out and put him into a quarantine tank. The ich seemed to get a little better but now he is sick with this. We are currently treating him with Maracyn-Two. This was the advice of our LFS. Is there a different medication we should be using?

I forgot to mention that I just tested the water and the levels are: Ammonia-0, Nitrites-0, and Nitrates- 0-5ppm. I think we really stressed him out when we moved him to another tank and took him away from his friends. Should we move him back or wait for his condition to clear? I appreciate any advice!

We moved Ipo back to the 55 gal tank and he seems so happy. I think the other two were happy to see him also. It's almost like it gave them a second wind to deal with their ich. Ipo's tail is looking much better. If we could just get rid of this pesty ich. I don't have a good feeling about it, but we won't give up until we have to.