OMG don't unplug the filter!  You need it running or your whole eco system will shut down!
You need alot of water agitation because warmer water has less disolved oxygen levels in it.
If you want to quit the salt treatment then that is up to you.  Treat however you feel most comfortable.
I don't think captain is going to make it.   He was too unhealthy to begin with.  You could just take the other fish back to petsmart and tell them to treat him that it is too stressful.  If you are picking feeder fish, then they are all unheathy.  They are disease ridden and culls.  They are food for other aquatic animals like turtles.  I've bought feeder fish from petsmart but have always had to treat them with oral antibiotics and water treatments.

I use sponge filter for my hospital tank so that way the sick fish won't get stuck to the filter/ filter strainer.  I use the one that's been in my cycled tank. Sponge filters will not remove medications.

Minde: I've been reading mine all the time! It's wonderful and has really helped me understand the osmosis and digestive system of fish The pictures were pretty disgusting at first though! xD Those gill worms and internal worms were horrible xD

Summer time: I'm so sorry that it's so hard for you But sometimes one can't save a fish no matter how hard you try simply because the disease has gotten too far before the fish started showing symptoms! I've told you all many times how it was with my oranda once (the golden one) I was noticing symptom after symptom on him and in the end it was nothing I could do for him because his belly was deformed and RED. Meaning that he was already eaten from within by bacteria.
Either way, you should absolutely continue treating with salt if you want to get rid of this parasite! And you remember, if it looks like velvet, keeping the tank dark would help too At least you could save the new fish! If you're worried about captain getting stuck in the filter, you could try to somehow cover it with something temporarily, like a pot or some bigger ornament on the bottom an inch or so from the intake. I'm sure you'll manage this time as you caught it so early!

How do I have a big ego?
I just treated two tanks with progressive salt treatment and it worked for me.
You asked for help and I gave it to you.  I also told you that you did NOT have to do the salt treatment if you didn't feel comfortable with it.  I also gave you links for information on treating velvet and other diseases.
I have had goldfish and some tropicals for most of my life.  
The reason I said to take the fish in to petsmart is that I know they treat their fish with quick cure and maybe they would treat it for yousince you bought the fish there. 
I'm very sorry if your fish died.  I didn't give you any suggestions for treatment that I wouldn't do to my fish myself.

I feel very sorry for you Summer time such a horrible thing to go through which many people on this forum wouldn't be able to deal with (me ). But maybe favouritism doesn't belong on this forum either  Everyone tried to help you and that is what we are all here for, especially Mindemae who knows an extreme amount!

Unfortunately you don't know the real health of a goldfish when you get it, nor it's background or what is has been through. We can try as hard as possible not to buy a sick fish but sometimes it happens. I've been through this lately, with alot of struggles with a fish that seemed perfect in the shop. I don't believe she is sick, but maybe not as strong as she looked.

Let us know how your other fish are going

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Here it is, hope you can find the info you need asap and save Captain.
Nossie and Mindemae kept goldfish much longer than I have, I believe and they both are an encyclopedia on legs, So I'd really follow their advice.

I keep fingers crossed for you

Summertime: What Mindemae said is very true and we just have to deal with the situation and hope for the best. I lost some of my favorite fish too. It made me very sad because you get attach to them. I understand how you feel.

Hope to hear more from you about your fish soon! Feel like I haven't seen any more detailed reports for a while now

Hi.  I'm glad you are all still giving me advice, even Mindemae.  

Captain died yesterday morning.  I guess he may have been to weak to treat, but I still don't like that answer.

The white fish (we've named him Flash) was fine yesterday morning, then 11 hours later, he had gone downhill really quickly.  Dorsal fin down all the time and not swimming much.  He also looked kind of yellowy, when he's normally bright white.

So last night I gave up on the salt treatment.  It definitely was NOT doing anything toward this Velvet.  Like Nossie, I too have read that salt will work on this, and that it will not work on this.  I'm convinced that it has no effect on Velvet.

Last night I put in Maracide (which treats Ich, Velvet, and other external parasites).  Then I did a 20% water change because I was uncomfortable with so much salt in the tank (even tho it may have been fine).  I realize I should have done the 20% water change before adding medicine.  Fed him freeze dried blood worms for protein (something I learned from all of you), and crisps.

Flash is much better today, dorsal fin up and swims actively.  The tank is in a room that's not bright, and it's been dark and rainy outside so that helps.


What I have learned from this is that since one fish was weaker and one strong, I would have treated them in separate tanks, using salt (unless it's Velvet, because salt doesn't treat Velvet), anti-parasite food, and heat on the weaker fish, and Maracide (for the parasites) along with Maracyn (to prevent any secondary infections) on the stronger fish.

The main idea is that the weaker fish will probably not survive the strong effects of some medications, so you would want to treat them with something that is easier on their system yet still kills the parasites/bacteria.

Sorry I'm so detailed, I'm like that naturally, will try to post shorter next time

I just want a house with 2-4 goldfish.  Not hundreds, and no hospital tanks all over the place, not yet anyway.    Just some pets  

Oh I'm so sorry to hear about that  It makes me really worried about where you got them from. I personally wouldn't want to go there again. Or and I'm sure you've said this (sorry!) but has flash been kept in the same tank as these two other fish? He sounds like a strong fish but I'm scared this disease is still alive so maybe keep up with the medicine just in case and the salt? I dunno, I really no nothing about vevelt

Still going strong  

I made a change to my earlier recommendation, which most of you probably already know this by heart, but for any newbies:

When I had to treat a sick fish I always put Stability in the hospital tank. It says on the label to also use it when your medicating. So I did!  

Hi Summertime, I've used Ammo Lock because ammonia levels were dangerously high when I was cycling my little 10gallon tank and I am still getting false readings in ammonia levels a month later. Even with multiple big water changes I haven't been able to get the reading to drop. I changed the filter media in my power filter (not the biofilter part) recently and that has helped. I recently discovered thru the help of a friend of Hanna's, that my tap water is the culprit because it has high levels of hydrated lime in it. This is confusing my ammonia readings - so frustrating. Wish I lived near a natural spring to get my water there. Sorry for the rambling my point is that I most likely didn't need to use ammo lock. I would not use that product again personally as I also learned that one of the key ingredients is formaldehyde, and I'm afraid that it could be toxic to my fish. The product Stability looks to be the one I need to get as I have begun to cycle a new larger tank for my little aquatic friend. Also some Prime and Purigen if I can get them here in Canada. I wish you the very best with your fishies

@Summertime: Your welcome 

Summertime, we must celebrate your darling fishies recovery!