F1 Vet I can just see you stomping your feet saying "I know I'm right, I know I'm right".

1) Believe me I understand that water H2O contains 2 oxygen atoms per unit. Grow up, I know my fishes gills absorb oxygen.
2) I understand aerobic an anaerobic bacteria much better than you apparently.
3) What you don't understand is gas exchange, Google it!
4) If you don't have N03 leaching in your tank why do you have Nitrates? the're the same thing. We all have some level of N03, unless you tape your fishes butt closed.
5) I own a couple of FX5s and they take more than 10min to clean, I'd like to see you make a video to prove me wrong. Start to finish.
6) I guess wet dry sumps don't need air??? You're feeding BB air in a WD. If you deny the dry part fresh air it will eventually be overcome by bad gases and kill your aerobic BB.
7) You would be loosing a area to re-oxygenate your water if you seal the sump or restrict it. So the water falling in from the tank would not oxygenate the water.
8) What's your problem, I look at your post on other threads and it seems like you like to go around and start arguments. The war is over take a