Ive had my two fantail goldfish for almost 6 months now and there doing fine but i have one concern. My orange fantail likes to float motionless on its side at the surface of the water. It snaps out of it after awhile and swims around with the other fish like its perfectly fine. Im really confused with whats going on with this fish???

Goldfishluver12, ther is this sticky which sticks out on the top of this section, the green writing. Please copy and paste and answer the questions and post on here.

We need more info to help you.

When u click on Health and Illness there is a post right under Subject that says, (Sticky):        FOR EVERYBODY AND ALL NEWBIES, please read before posting a Health Issue.  You can copy and paste it and answer the questions, its hard for anyone to just know what is wrong without knowing a bit about the tank, water, ect. first and then can better determine what might be causing the fish to do this.  Could be a water issue to food issue to illness of some sort, the answers will narrow it down for them.   

1. How big is your tank:  Gal / liters
-my fish tank is a ten gallon for now

2. For how long has the tank been set up:
-almost 5 months

3. How many fish:
-2

4. What kind of fish:
-fantails

5. What are the water parameters:    Ammonia.........ppm
                                                            Nitrite..............ppm
                                                            Nitrate.............ppm
                                                            pH..........................
                                                            Temp...............degrees Celsius / Fahrenheit
-haven't gotten to it yet

6. How often do you perform water changes:
-each week

7. How big are your waterchanges:      .........20............%

8. What kind of waterconditioner are you using:
-tetra

9. Do you add beneficial bacteria:
-no

10. Symptoms your fish is showing:
-it floats on its side for short periods of time then kicks out of it and acts normal

11. Since when does your fish show these symptoms: 
-about 2 weeks 

12. How is the normal behaviour of your fish:
-plays with the other fish, eats normal every day, and swims around happily

13. How do the other fish behave:
-it plays with the other fish, eats regularly and swims normal and theres no signs of illness.

14. Post pics of the sick fish:


15. Do you have a filter on your tank, what kind, how big (gallons per hour)
-yes, tetra, 2-10

16. Do you provide extra aeration with an air pump and air stone/diffuser of some kind.
-no because the oxygen is provided from the filter waterfall

Test your water, and no matter the parameters, I think you need to change about 70% of the water in one go now, and later test every week and change according to test results. 50% water changes if the nitrates are between 10-30ppm, 70% again if it's 40 or higher.

Whats recommended for goldfish is 20g for the first fish and 10g for every fish after that in the same tank, so you would need a 30g tank  for them to be healthy and grow.  Goldfish can be very messy as far as waste in the tank so the bigger tank the better and the more filtration the better also.  Along with what Minde and Nossie suggested since they are more experienced than myself. 

My goldfish were so very happy when I added an extra bubble wand along with one that was in there already and the large filter that flows into the tank.  They are so much more active with all those bubbles going.   

Edited:  You were typing while I was typing. lol
That's great that you can get a 50g for them, that would be lovely.  You do however need the little pump and an air bubbler,  they don't cost very much and you can move it to the 50g when you get that set up.  You will see them much more active with one I promise.

Actually, a 20 gallon is perfect for two goldfish It's because of the measurements of the tank that the first "lonely" fish needs 20 gallons. If the tank is larger than that, you can easily and safely add one fish per 10 gallons of tank volume

I haven't seen anything else except that either But I think I read it somewhere that someone is calculating the stocking levels like this...? It seems very reasonable to me at least My tank's a tad overstocked though... I was very much into picking lots of interesting looking goldies... xD

Egg bodied goldfish do better with sinking pellets rather than flakes.
Flakes tend to cause constipation problems.
Frozen peas thawed out and skin removed are good fiber source.
Also freeze dried shrimp is also good, high in fiber.

My advise for you is to get a bigger filter and or an airstone with pump.
Goldfish cannot breath air at the surface and need moredissolved oxygen in their water...so does the beneficial bacteria in your tank and filter media.  More dissolved oxygen means a healthier environment for your fish and healthier fish and less problems with your fish and tank.

Thank you so much and your fish thank you too!
You will definately see a difference in a few days.
Your fish will become more active for one thing, with the extra oxygen in the water!

If you want to, you could have a look at the sticky thread in the general goldfish discussion-part of the forum It's called "Guide to feeding veggies" and it contains lots of different types of foods you can give your fish
You can keep the flakes even if you'd use the pellet as a staple diet and feed them flakes only once in a while as a treat!

You are very welcome!