Planted Tank Guru
Join Date: Sep 2006
Location: Northern California
1) Too much yeast?
2) Did you use a gas separator?
3) Check valves help to prevent yeast muck from getting past it. It just clogs up the valve even though it's supposed to prevent water from flowing the other way.
4) If you stuck it too far up your intake, the suction from the filter might've helped suck the yeast into the tubing.
skiboarder72: In your gas separator, the tubing from the yeast bottles goes almost all the way to the bottom. The water goes maybe 1/2 up the bottle. The tubing from the separator is about 1/2 to 3/4" from the very top of the cap. I siliconed it in just to make sure.
This way, save for a huge explosion which shouldn't happen anyways, there's no way yeast can get into your tubing.