[squatingdog]

add plants around it and that might hide the diffuser so your betta doesnt gas its self

 

[Spanishearl]

There are plants around it, but he wiggles through them.... :/

 

[Mirkinator]

I have a canister filter in my Spec V and will be running an inline diffuser. You can put the inflow and outflow in the same spots as the filter that comes with it (with a small amount of modding). I currently run them both at the same time, but will be moving them as soon as I have time to completely set it up. But currently just have the diffuser right under the canister intake and its so close my betta cannot fit in there :

Far right tank:

 

[Spanishearl]

Thanks, I may have to do some changing around of my tank, I like the idea of an inline diffuser over having this passive one in there. I don't want any equipment in the display...

Very nice tanks btw!

 

[nomad1721]

Why not just use a glass/ceramic diffuser? They look a lot nicer than those giant Fluval ones.

*edit* I just saw that you wanted to try and hide the co2 diffuser. Nevermind.