Tom Barr;28678 said:A new(?) and novel method(?) to add O2 at night without an air stone:
Use a reducing tee off the return pipe and place a check valve to prevent back flow into a small air pump, place the air pump on the reverse cycle of the CO2(or a few minutes in between etc).
This will add lots of air and O2 during the night, keep things clean without adding anything inside the aquarium.
Cost is pretty cheap.
Will allow more fish and reduce the CO2 when you do not need it for plant growth.
I never liked the idea of adding air stones in the planted tank, another tube and thing to hide and more complex. But if I can add one without that and make it simple and more effective, it adds a bit of a buffer for the fish. I have some cube tanks which have high fish loads and current but the O2 levels had still been lower than the longer tanks due to turn with the much small relative surface area to water volume ratio.
Also, if you have a lot of fish, loading etc this might help, others might not need this at all.
Here's how I did it:
Used this as a Tee:
Aqua Medic Reducing Tee - 15 mm x Airline Tube, Plumbing Parts > CO2 > Saltwater Aquarium Supplies
Added a Check valve to prevent backflow when the air pump was off:
Aquarium Check Valve | Inline Check Valve
Then you add an air pump like a small (no need for larger ones, you'll get plenty of aeration via the mixing) Whisper:
Aquarium Air Pumps: Whisper Air Pumps
Put you out about 10$, minus shipping.
Add this to a timer to do the reverse as the CO2.
This keeps the O2 @ 95% and above.
No air stone, nothing inside the tank and pretty quiet.
The other thing to consider if you buy a larger filter with high flow and you want to reduce the higher pressure and swaying is to use an eductor:
Much of the flow and mixing devices are from the reef side of the hobby, and I keep both so I can apply things from that hobby into this side.
This is why I encourage folks to try non CO2 planted tanks, focus on fish, marine plants etc, not just CO2 enriched systems with a few small fish.
You learn more from trying and doing more things in other parts of this hobby.
I want to know the size of the outlet/inlet of the aqua medic tee