Co2 Diffusor placement
I'm using two nano diffusors and DIY Co2 in my 20 gallon.
Question is, what is the best placement for the diffusors:
(I have a HOB filter)
1. Directly by the filter intake
2. Directly by the outlet flow, or near the path
3. In the opposite end of the tank furthest from the filter
4. One in each corner