Help Yugang CO2 Reactor fittings MOD and my pH drop Problem

[BigWave]

Here is a pic of the reactor. The top tape mark is when CO2 has been off all night. The bottom tape mark is when its on fully after several hours.
Maybe on my next day off Ill try and calculate the volume of displacement



Here is a small video of the sound from water displacement. It shows the water level pretty clearly also. Mind you CO2 came on at 430am and its 630am right now so not the best shot but you get the idea.

View attachment VID_20260107_064223.mp4

 

[Naturescapes_Rocco]

Are you aiming to use the reactor in overflow mode or regulator mode?

 

[tjcline0]

Here is a pic of the reactor. The top tape mark is when CO2 has been off all night. The bottom tape mark is when its on fully after several hours.
Maybe on my next day off Ill try and calculate the volume of displacement

This totally makes sense, but I'm surprised its such a large amplitude. I think there is a geometric explanation for this large amplitude. The ARC reactor has a large diameter, but is relatively short. When you increase the radius of the tube, the volume increases faster than the surface area achieved for co2 diffusion. If you were to use a smaller diameter tube, but make it longer, it would have less volume for the same surface area for co2.

 

[techman81]

Here is a pic of the reactor. The top tape mark is when CO2 has been off all night. The bottom tape mark is when its on fully after several hours.
Maybe on my next day off Ill try and calculate the volume of displacement

View attachment 13053

Here is a small video of the sound from water displacement. It shows the water level pretty clearly also. Mind you CO2 came on at 430am and its 630am right now so not the best shot but you get the idea.

View attachment 13054

Again, I'm still in the learning phase as well, but something seems off. With a gas pocket that large, you should be seeing much higher CO2 and have a yellow drop checker in a 20 gallon tank. That pocket should be enough for a tank double the size. Perhaps there's much higher off-gassing? Are there other filters or heavy surface agitation?

Edit: Went back and saw that you're running 2 canister filters on this tank and I'm wondering if that may be the answer. May I ask why 2 filters on a tank this size?