In few months i am moving to different location so i will move my 14gal. Its just 14g so no big deal but... 
I want to change tank glass (cause is around 8 years old) and sand. So my plan was:
- Buy new 14gal and test for leaks
- Move half or all?? old water to new tank
- Attach old external filter to new tank, add new substrate and sand and add start bacteria??
- Move fish to new tank
Would be this OK or would be too risky (losing good bacterias in sand ...) ? I have around 15 fish and Eheim ecco pro 130 canister. Tank is running for 3 years.
I want to change tank glass (cause is around 8 years old) and sand. So my plan was:
- Buy new 14gal and test for leaks
- Move half or all?? old water to new tank
- Attach old external filter to new tank, add new substrate and sand and add start bacteria??
- Move fish to new tank
Would be this OK or would be too risky (losing good bacterias in sand ...) ? I have around 15 fish and Eheim ecco pro 130 canister. Tank is running for 3 years.