rockyofhockey
Aquarium Advice Addict
- Joined
- Jan 16, 2014
- Messages
- 1,532
Plumbing for the tank. Whatever you have in the way of pipes or tubing leading from/to your filters.
A bottleneck upstream of a pump can cause a rapid change of pressure in the water flowing through it which will cause bubbles to form and get chopped up into finer bubbles that get returned to the tank.
Checked all the filters and seem to be fine ...
Rockyofhockey _/.\_