thanks for your time.
I've read that aquarium glue which is made of silicone is resistant to heat and water so I thought it would be safe.
getting a replacement tank would be very expensive for me because I live in Persia/
Iran and Trump recently put heavy sanctions on Iran and we live quite in isolation.
I'm sorry to hear you are in such a difficult situation Amin!
The problem is that if you inhale an unhealthy chemical it can easily move from your lungs to your bloodstream and that can become really serious, and quite quickly.
Aquarium glue is safe for fish so it should be fairly safe as glues go, but it is not used in any atomizers we vape. No glue is used in any of them because of the dangers involved with them interacting with all the possible combinations of vape ingredients we use.
I hate to say this, but if I were in your situation I would go back to smoking for a while until I could get replacement hardware for vaping. The risk to my kidneys or liver associated with vaping unknown chemicals is just too great for me to try doing it, for any length of time.
Having said that, if you can get safe O-rings in a size that will seal the bottom of the syringe sleeve I would consider that an acceptable temporary solution. In my opinion, if your juice does not change the syringe material over time it is likely safe. Ultimately though I would look for a hardware solution that all works properly.
Best of luck with it!