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How big is your turtle? 6.3 cm
How long have you had it? 20 days

What is the water temperature? --
Are you using a water heater? No
How much water is in there?10 cms deep
Are you using a water conditioner? Reptosafe
Are you using any filtration? Yes

What is the basking temperature? --
Is there a basking light? Yes
Is there a basking platform that is easy to climb on? yes
What kind is it or what is it made out of? rock
Is there a UVB light? yuppers

What have you been trying to feed it? lettuce,carrots and Repto mini
When was the last time your turtle ate? this morning

How big is the tank/pond/enclosure? 40 cms long,25 cms on the sides,26 cms tall
Is the tank near a window? Yes
Is the tank in a room with a lot of activity? sorta

Have you read the Basic Care section? Yes
Have you searched the forums for similar situations? I don't know what too type in lol.

Alright,opus sometimes opens his mouth and breaths and this is the first time I've seem him do this but their was bubbles popping and making a clicking noise(it makes a clicking noise when the bubbles pop)
Is he cold?does he need a water heater?

Does he open his mouth above water and breathe? Any kind of wheezing sounds? Clicking and popping noises accompanied by open-mouth breathing and bubbles coming out of his nose are not good signs at all, and could even be a signal of RI.

I've seen my turtle yawn once, however, and apparently healthy turtles may do that occasionally. Do the bubbles on the nose look like mucous or anything of that sort? How often do they appear?

At any rate, I'd definitely find out the water temperature, get a heater, and make sure there are no drafts in the area by the tank. Also make sure the air isn't too dry. In truth, since I'm a worrier by nature, I'd definitely consider a vet visit just to be sure.

They're just bubbles,after they dive in the water I guess water goes right up his nose.I tryed putting a drop of water on his nose than the bubbles came out,and it might be a simple yawn!but hey,he hasn't had a yawned in awile.And my mother says I don't need a water heater and that I just need too put warm tap water in until it's autum.

You usually can't listen to the advice of mothers.

My mom told me to free Serra to the SEA when she grows up! She's not even a sea turtle!!

I think Threepwood said it well - what you're describing might be symptoms of a respiratory infection (RI). That's not for sure however because it's a little unclear what's going on.

Here are the classic symptoms of RI:

1. Lethargy (tired, sleeping or basking a lot)
2. Poor or no appetite
3. Breathing with the mouth open or yawning a lot (sometimes accompanied by clicking or wheezing sounds)
4. Mucus around the mouth or nose
5. Swollen or irritated eyes

Do any of these things sound like what's going on with your turtle?

To keep a little turtle healthy you need to keep the water temperature at a fairly steady 78 degrees fahrenheit (26 degrees celcius) and the basking temp at approximately 88 or 90 degrees fahrenheit (31 or 32 degrees celcius). The only way to know if your temps are right is to measure them with a thermometer.

Opus, I remember you asking about taking your turtle outside for sun. If so (sunlight is good), be careful of exposing him to cool breezes/drafts? Also be careful of air conditioning if you have him in a room that has one. You need to get a thermometer and check the water. If it's too cool, yes, you need a submersible water heater.

Ok,I will get a heater s soon as possible!!!!!!and I mean it too the ends of the world!!!!

Are they air bubbles or like mucus bubbles?

I don't know,like when you have snot clogged in your nose sometimes you get some bubble popping.

Snot is mucous. Having said that, if the bubbles appear often, and especially above water, then I'd take it as something to be concerned about.

I agree with Threepwood. If the bubbles are mucus then you need to get your guy to a vet as soon as possible. He's probably got a respiratory infection. Only a vet can treat it. Your turtle's best chance for survival will be to be treated by a vet as soon as possible. Until then, keep him warm (around 80 or 82 degrees fahrenheit), avoid stress, keep his water very clean and keep offering him food to eat.