1. How big is your tank:  Gal / litres   125gallons  (old tank is 30gallon)

2. For how long has the tank been set up: Approx 15hours

3. How many fish: 5

4. What kinf of fish: All fantails

5. What are the water parameters:    Ammonia.........ppm All zero as I just set it up today
                                                            Nitrite..............ppm
                                                            Nitrate.............ppm
                                                            pH..........................
                                                            Temp...............degrees Celsius / Fahrenheit   70 F

8. What kind of waterconditioner are you using: Aqueon

9. Do you add beneficial bacteria: Yes

10. Symptoms your fish is showing:  Sitting very still on bottom, barely breathing

11. Since when does your fish show these symptoms:    one hour (12.26.11)

12. How is the normal behaviour of your fish: Isn't doing anything, did not eat evening meal

13. How do the other fish behave: normal

15. Do you have a filter on your tank, what kind, how big (gallons per hour)  Do not know gph. One Marineland Magnum 350, one AquaClear 110

16. Do you provide extra aeration with an air pump and air stone/diffuser of some kind. Yes

I set up this tank last night and began filling it with water at 5am today. I carefully added conditioner, bacteria and salt. I put in three heaters to bring the temp up to room temperature (same exact temp as my other tank) I then removed the heaters and let it sit until 5pm (12 hours) when I added five fantals 1-3" in length. Four of the fish have been very active, they ate and are behaving normally. Holly swam right down to the bottom and didn't move. After about 20 minutes I put her back in her old tank where she perked up slightly but is still not acting normal. Does anyone have any idea what could be wrong?? If she lives through the night can I put her in the big tank? Or should I take everyone out??

You probably just shocked her. Leaving the tank empty for a couple of days would probably have been a better idea for everything to start stabilizing I left my tank alone for about 3 days before I introduced my fish, and then I added only a few of them at a time, however, in such a big tank, 5 does count as "a few at a time"

Salt slows down the beneficial bacteria (not to mention that it's a waste of money to put it into such a large tank, I used two packages of salt when I had to treat my 83 gal :/), so if you can, just avoid the salt. It could have been another factor in shocking your fish.

Just keep an eye on your fish, maybe you need to wait with letting her in with the buddies until the tank is close to cycled?

Good to hear
Keep us posted on the cycling process, and good luck!

I noticed that when I set up my new 60 gallon back a month & half ago, that I shcked my poor fish too. Scales started falling off, they had splits in there tails, would just sit there. Poor thing more than likely is in shock, I wouldn't put her/him back in the new tank, I would leave her/him in the old tank for now. To much at one time, can make things worse, she maybe better off in old tank til cycled.

Fresh tap water is definitely the way to go! If you add water from the large tank, you'll get a bunch of ammonia into the tank, and that would defeat the purpose of changing the water, just take care of the fish Once she'll be healthy, you can move her back to the large tank Since they're in the same house, the water will be largely the same anyway once it stabilizes.
Just keep the water close to perfect quality, and she should recover just fine!

Salt should not be added to a goldfish tank, many people have this misconception that salt should be added with every water change, but it's really not needed for freshwater fish, since they're not designed to live in salty water. It will irritate them in the long run, they can tolerate pretty high concentrations of salt, but they shouldn't be living in them on a daily basis, unless you need to treat something or protect them from a nitrite spike.
It also slows down the beneficial bacteria that break down ammonia, making your fish subjects to poor water quality. Had a nitrite spike in my tank recently after having to treat with salt :/

As Goldfishnoob says, the tank isn't cycled yet, so the water quality will be fluctuating a little now with ammonia and nitrite spikes, that is going to be stressful for your fish, so be alert! Test the water every day, and change 50% of the water while adding beneficial bacteria every time the test results are too high. Feed your fish only once a day, or once every other day

The water sounds fine... is the temperature okay?
These fish may not be used to waste in their water, so that's probably it. Luckily, you've got very few fish in the tank, so they should be safe, just keep monitoring the water!
Hope you're adding a lot of beneficial bacteria. Did you use any gravel from the previous set ups?

I know how it is
Going through a rough patch with my tank myself, had a nitrite spike recently and one fish with full-fledged dropsy
Worried to bits D:
I really hope they won't be getting sick or anything because of the cycling. But if you notice that any of the fish are getting worse, you could move those back to the smaller tank, that would probably help them a lot

Absolutely not! Ammonia is far more harmful than that! What a mad book >>
In any case, I'm glad you found a method that works for you and the fishies!

Usually something as simple as separating them helps, they'll feel more like newbies once they'll be back in the tank, especially if you're rearranging it
Glad to hear the cycling is going forward!

Lol, it really is. I have 5 goldfish tanks and a betta tank. I'm hoping to end up with 2 plus an iso but these guys still aren't getting along.

Haha I guess so. The house is kind of taken over at the moment. I have 10 and 29 gal in my bedroom, 55 gal in the formal dining room which is never used and 125 gal and 30 gal in the living room.

Yes but so many fish.  and I almost got ANOTHER oranda today until I came to my senses and realized I have no open isolation tanks at the moment. Lol. I'm hopeless.

I love my fantails but now I am partial to orandas I think. I can not wait to have 5 little moors/telescopes in the 55 gal! They are so sweet.

I have heard the same. My moors don't even do well with my fantails. If I had speedy goldies  I'd probably go for shubunkins. Someday. A pond is the ultimate dream.

I have also been planning a nice tank with a few panda moors Maybe a 30-40 gallon?
Fantails are indeed lovely! And ideal for those that want fancy goldfish but not too enhanced I have a very soft spot for orandas though, and they're so hard to find here! It breaks my heart that the few I got were so unlucky