Dutchz
Aquarium Advice Freak
- Joined
- Nov 25, 2012
- Messages
- 305
More bb is in your filter media than your substrate, and using a gravel vac won't disturb your bb enough to notice. Also, if you're adding juvenile Cory's or small Cory's you should be fine adding six at once, but as always just watch your parameters.
I totally agree with you just rinse you mechanical sponges often. And test water. What are you using to test?