I answer one by one
Aeo- is the smaller turtle in the same enclosure as the larger ones? - Yes
I seperated her
When she's breathing heavily is her mouth open? - Yes
Do you have a UVB light? - No, sun light can reach directly to the basking area. I'm in Vietnam so there's much sunlight
Also, it helps if you answer the following:
How big is your turtle? - shell length is about 5-6cm
How long have you had it? - 2 weeks
What is the water temperature? - 25-28 C degree
Are you using a water heater? - Nope, Vietnam is already hot enough
How much water is in there? - 6" depth
Are you using a water conditioner? - No
Are you using any filtration? - Yes. And it works very well. 4 months no tank cleaning but the water is crystal clear. I change 20% per week.
What is the basking temperature? - 30-33 C degree
Is there a basking light? - No
Is there a basking platform that is easy to climb on? - Yes
What kind is it or what is it made out of? - It is a big rock
Is there a UVB light? - No ( already answer above )
What have you been trying to feed it? - 2 days after I had it. I feed it lecttuce, small feeder fish,... in seperate tank
When was the last time your turtle ate? - it's not eaten since I had it.
How big is the tank/pond/enclosure? - 1.2m x 0.5m x 0.5m ( big enough I think )
Is the tank near a window? - Yes. So that basking area can have sunlight directly.
Is the tank in a room with a lot of activity? - No, from 6AM to 7PM there's no one. From 7pm, I use my PC
Have you read the Basic Care section? - Yes. My 2 bigger RES are so healthy
Have you searched the forums for similar situations? - No but I'll when I have time ( in weekend )
Is there any other unusual activity/symptoms?[/quote] - It sleeps too much, no eat, open mouth regularly, make noise when breathing, eye swell up.