twestacott
Aquarium Advice Activist
- Joined
- Jan 15, 2012
- Messages
- 112
I have a cannister and a hob running on my 75 gallon. The HOB sponge cartridges seem to be a bit beaten up and need changing. If I am not touching the cannister is it safe to change the sponges on the HOB without causing the tank to cycle again?