A glass diffuser like that is really to small to do a tank that size. Even using a powerhead. UNLESS you set it up in a internal tank reactor with a powerhead that has a impeller set up to atomize it and distribute. The other options are an inline reactor to your canister filter. Its my preferred method actually.
What are you using as a filter?
That sounds better than the one I got. I'm using a marineland c360 canister and an emperor 400 hob
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