Airflow for Large Aquarium Co-Op Sponge

[Luxa]

Hi there; very simple question. On my 65-gallon goldfish tank, I just got two new Large Aquarium Co-Op sponge filters and a Ziss airstone for each. What amount of airflow is optimal? Obviously I want to pull water through the sponge, but I also don't want to create excessively large bubbles with decreased lift. I am current running a Tetra Whisper 40 on EACH sponge filter. That's ~1.5 L/min. of air each, and the surface of the water is gently "boiling". Have people had success with that sort of flow rate?

I'm also losing some bubbles out the top of the sponge, but I think I can fix that with some minor wiggling. Thanks in advance!

[Cory]

Have you watched this video?

Basically you want uniform air bubbles that don't form larger air bubbles, and more air doesn't mean better flow. The right amount of flow, provides much more lift.

[Luxa]

Thanks, Cory!

It's really cool to hear from you personally; big fan.

My sponge filters are running exactly as suggested by your video. I had some air leaking from the sides, but by shortening the internal tubing length, I fixed that problem easy peasy! Thanks again!

[HotTunaCartel]

@Gabe P.  I use the aco nano air pumps, they work great.  I honestly don't notice any flow difference between the nano pumps and my old hydrofarm 125 active aqua pumps.  

Edited November 25, 2021 by HotTunaCartel

[Helan]

I am using eheim air 400 and it is silent considering it’s great air output