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wots the best type of difuser

I prefer the inline but i suppose its each to their own, i assume the pretty much do the same job its just the visual aspect of it being inside/outside of your tank.
I don't think there is any difference in performance but someone may correct me. Only thing i can say is that with an inline diffuser i found that my co2 bubbles got distributed more around the tank when i used my spray bar.
i have a external with spray bar and could go that way and i have many places to hide a glass one so im stuck with wot one to go for
I personally like the aesthetics of in-tank diffusers and would have thought that assuming you have good flow around the tank then dispersion and distribution would be just as good as with an in-line.