I'm using the atomic online diffuser on my 57 G and it works amazingly well, no bubbles. I would recommend buying two so you can swap when cleaning them.
I have a video of the atomic diffuser in action: https://www.youtube.com/watch?v=Y1yF...e_gdata_player
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The green leaf aquatic one right? What size are you using, since there seem to be different options.
And this might be a silly question, but the inline should be connected to the outtake tubbing and not the intake right?
Also, if you had the time to look at my 75 journal that'd be grand, because I'm not sure which filter would be better to connect this too, the right side or the left? Left already has the heater but I'm not sure if that matters.