postion of glass diffuser

[chua]

Where will you put the glass diffuser for most CO2 to dissolve?
If the inlet attached to water skimmer is at the right back and the water outlet attached to the rain bar is at the left back.
Thks.

[vinz]

I would put it as deep as possible where as the bubble rise, they get caught in a current and get transported around the tank. You'll have to trial and error to see where that would be.

You also may want to consider whether you want to see the diffusor or hide the diffusor.

[chua]

Vin
I know what you mean. Hence i put it at the front right. So the water outlet from the rain bar at the back left will flow in a circular moment carrying the CO2 bubbles along the way.
But later i realized that those bubbles on the surface which is being carried along the way go directly into the surface skimmer which is on the back right.
So where will be the best position then?
Thks

[PeterGwee]

Chua, how big is your tank? Smaller tanks don't have CO2 distribution problems like a long and big tank do. A dark spot is better for a diffusor as algae tends to grow on it if the light source is abundant.

[chua]

My is a 3ft tank.
Lighting is 4x36W PL lighting.
Most of the plants are on the right.
Hope these can help.
Thks

[PeterGwee]

Okay, the method relies that you have a pH meter...measure your KH then find your pH using the pH meter (Giving you an idea how much CO2 you have for the particular spot using the pH/KH table). Measure the pH at different parts of the tank after running your CO2 for a while. Is there any big difference in the pH at different parts of the tank? The part that has the highest pH as compared to the rest of the readings is probably getting the least CO2. Is it where the plants are? If no, then it should not be of much worries. Efficiency of CO2 dissolved is what you should worry about. (External Reactors are generally much more efficient..Diffusors? Maybe ADA stuff..)

[sherchoo]

Like what vinz said, it depends whether the diffuser to be seen or not. Normally people would want to hide the diffuser so a planted would look more natural without strange equipment visible. Placing near the filter intake may help with co2 diffusion but IME, it doesn't differ much.

Hope this helps.