Adding more fish to quarantine tank

[Madreefer]

A 3" tang in a 20g long? I won't comment on that one. I'm sure there's someone on here that will try ripping you a new one for that alone.
I'm not a fan of quarantine tanks. IMO it causes more stress. That's a different topic all together. But plugging more fish in there is kind of defeating the purpose of quarantining anyways isn't it? Just prolonging your quarantine time. No treatments nor filter is more of a holding tank isn't it?

[The Guy]

Originally Posted by Madreefer

A 3" tang in a 20g long? I won't comment on that one. I'm sure there's someone on here that will try ripping you a new one for that alone.
I'm not a fan of quarantine tanks. IMO it causes more stress. That's a different topic all together. But plugging more fish in there is kind of defeating the purpose of quarantining anyways isn't it? Just prolonging your quarantine time. No treatments nor filter is more of a holding tank isn't it?

Hope the tang cops aren't around! but it's just not a good idea to put him in a 20 g long even on his own, I agree with Bill it will probably stress the tang out more. My 2 cents worth!!

[Myka]

Wait until the Tang is done his quarantine before adding any more fish. Patience in this hobby is very important. You don't want to risk bringing in disease to a fish that, I assume, is doing well.

In the future, a 3" Yellow Tang and other fish of similar size and activity level would fare better in a 36" quarantine tank like a 40-gallon or a 33-gallon. You may find you get greater losses by using such a small tank for a fish of that size and activity level. A 20-gallon quarantine tank is better suited to smaller fish, or a small group of Chromis or Damsels like you're planning.

[The Guy]

Originally Posted by clown lover

Hope the tang cops aren't around! but it's just not a good idea to put him in a 20 g long even on his own, I agree with Bill it will probably stress the tang out more. My 2 cents worth!!

Ok now we got the whole story, I probably would have done a rescue buy as well and try and help him get healthy. If a 20 long is what you have for him to get better in then do your best to keep your water quality up and I agree the garlic drops in the food is a great idea.
You may want to try some nori/seaweed on a clip, my tangs go crazy for it. But do not add any fish to the tank. Good luck hope the tang makes it.

[gregzz4]

Forgive me for not reading the whole thread, but from what I've read ...

You are running a QT without filtration - I'd change that pronto

I'd be using at least some kind of HOB Aqua filter

Do NOT add any new fish to your QT until you have your levels under control

And I suggest you learn about the Nitrogen Cycle before you add any more fish to your tank