Using air stone with CO2 injection?
I know this is a weird question, but I'm thinking of injecting CO2 and adding an oxygen airstone into my planted tank.
I normally wouldn't do this because the oxygen will cause the CO2 to fizzle out. But I have a unique problem.
I'm going away for 3 weeks and there will be no water change for 3 weeks. Someone will feed the fish every day, and top up water every week - that's it. Even if there's a floating lizard in the tank, they will not remove it. So this tank has to be on autopilot for 3 weeks.
The CO2 is hooked up to a PH controller that regulates the PH to 6.8 (+/- 0.1). The lights are timed for 6 hours.
The problem is after 3 days, there is a surface film buildup. Had this since day one and this is due to the ADA soil. And I cannot stop the surface film from building up.
Eventually the film will stop gas exchange and it can starve my tank of oxygen.
Protein skimmer or surface skimmer is not the solution. I actually have one but the floating head has to be cleaned of leaves every 3 days or it will get clogged. It will not survive 3 weeks without cleaning.
Surface agitation may be another solution. I can adjust my lily pipe to break the surface, but this will certainly fizzle out the CO2 at a high rate.
Or I can use an airpump and pump in a tiny amount of air with an airstone. This I hope will reduce the CO2 fizzling out.
I've never used an air pump before. With an air pump, can I use a CO2 diffuser instead of an airstone? I have an extra unused diffuser but will the airpump generate enough air pressure for the diffuser to work?
Is it possible to adjust the airflow from the airpump?
My objective is to keep the tank alive (shrimps and all, and also the plants that need a moderate CO2 level).