ThomasG07
Aquarium Advice Freak
- Joined
- Jul 16, 2012
- Messages
- 253
How long does it take for a second filter to build bacteria on an already cycle tank
jlk said:I dont know if there is an 'correct' answer but the longer you can leave the new filter in the cycled tank, the better. The minimum I would suggest would be atleast 3-4 weeks.