This is a new tank set up for me. It cycled in 10 days using filter media from my established tank, Safestart and feeding fish food for the Ammonia. Then waited for several days to keep testing the water to make sure its stable and then i went and got 1 Oranda and 1 Ranchu. I done a 80% water change that day before getting them and added more Safestart. I noticed in the store where i got them that the Oranda and her tankmate both had folded Dorsal fins, im not familiar with Orandas (i was originally going for a Fantail and Ranchu) so i assumed that was what they looked like. This fish store is fantastic usually i get all my fish from there and have never had any problems, they are not a bad establishment like alot you see. So i didnt consider they were ill. Got home and they settled in great, after roughly 6 hours i noticed her resting on the bottom of the tank. She was there for about 10 seconds and then she carried on swimming again and i havent seen her do it since. This raised alarm bells for me so i checked online and found out about her fin being wrong and they are supposed to be up for Orandas. So ive kept an eye on her and other than that she seems healthy, she doesnt swim around as much as the Ranchu he seems to be a ball of energy alot of the time! Checked her fins very closely and i cant see any white spots/veins or problems at all. I feared it could be Ich. Finally today i just saw her poop which is clear and slightly whiteish with little air bubbles in it and bits of brown which look like digested food and now later on in the day its still the same colour but it looks zig zaggy. Its thicker in some places than others and is a long string. This is the only time ive seen her poop and i cant find anymore of it around the tank. This is the third day of having them and ive just done a 40% water change. I always keep Protozin White spot and Fungus treatment in stock and was considering starting a course of that but as i dont know whats wrong with her i dont want to put strain on their bodies if its not needed.

1. How big is your tank:  170litres (50 US gallons)

2. For how long has the tank been set up: About 2 and half weeks now

3. How many fish:2

4. What kinf of fish:1 Oranda and 1 Ranchu

5. What are the water parameters:    Ammonia.........0.25ppm was 0 until i added the new fish. Was 0.25 before and after the water change.
                                                            Nitrite..............0ppm
                                                            Nitrate.............40ppm
                                                            pH..........................7.6
                                                            Temp...............24 degrees Celsius

6. How often do you perform water changes:once Weekly usually

7. How big are your waterchanges:      30%

8. What kind of waterconditioner are you using:Nutrafin Aquaplus

9. Do you add beneficial bacteria:No

10. Symptoms your fish is showing:Clear slightly whiteish poop with little air bubbles in it and bits of brown which look like digested food at first and now its still the same colour but it looks zig zaggy. Its thicker in some places than others and is a long string. Her dorsal fin is lying flat and never goes up and she has lead on the bottom of the tank once that ive seen in the 3 days ive had her.

11. Since when does your fish show these symptoms:  The first day i got her i noticed the Dorsal fin and lying on the bottom. Just saw the poop today.

12. How is the normal behaviour of your fish:I dont know she has been like this since ive had her

13. How do the other fish behave:Ranchu seems normal, very active and pooping normal

14. Post pics of the sick fish:
Sorry my camera is rubbish so not great quality.


15. Do you have a filter on your tank, what kind, how big (gallons per hour) Yes a canister, not sure on Gallons per hour but i know it does 1800LPH

16. Do you provide extra aeration with an air pump and air stone/diffuser of some kind. Yes i have a bubble curtain going along the whole back wall of the tank

Thank you for your advice i shall definately do that ill de-shell some peas for her.

Gave her some peas and she loved them I have some Elodea Densa in my other tank i shall add a bit in there for them, i have 3  anubias (cant remember which type, a big type not the smaller ones) at the moment in with them and im pretty sure they have had a nibble on one already 
Her poop has returned to normal today im so happy! She has rested on the bottom for several seconds a few times ive seen today and her Dorsal fin is still down, though does go up for a second or so now and then so im hopeful for her full recovery fingers crossed.

any updates on the little girl?
pardon me, i have a habit of stalking the health and illness posts xD like to learn all that i can (: