I currently use a rainbar.

[yuji]

My worry is that if the rainbar is below water level, then effectively the dissolved oxygen would be lesser than if I had placed the rainbar above water.

pls enlighten me.

thanks and regards

[ervine]

below... definitely below... unless you want salt all over everything in a 1m radius...

Dissolved oxygen can come in through the skimmer or overflow etc, more than enough...

[yuji]

overflow? but i'm using a canister.. that's why. as for dissolved oxygen from skimmer, i don't think that's enough right?

[sunny03]

i am also using a canister for my 2ft tank and i place my rainbar under the water level best if you can place it behind the LR

[Golden Tooth]

U'll get those fine bubbles if u place above water.

[hammy]

i will advice u to put it below water surface ... last time my rainbar is above water and it create a lot of prob for mi and if i am not wrong as long as ur water surface is sufficiently agitated , and ur skimmer is doing well, the O2 level shold not be a prob

or u see ur fishes like grasping for air ???

[Volitan]

O2 is dissolved when there's interaction between water and air. Water movement allows that interaction which hence improves air circulation. It's not the same as the air bubbles that you see when water from the rain bar splashes into the tank's water.

[ervine]

Skimmer confirm enough.... seriously just put it below

[rockfish]

i'm using a rain bar too .. i would suggest just below the water surface.. so that when the return pump stop, the water back flow will not be too much ..

but i'm not sure if there wil be back flow for cannister..

[Zero Oxygen]

If you afraid of not enough dissolved oxygen....

You can place your rainbar, vertically at one corner.......

let one of the output hole be slightly above surface and the rest below lor.....will solve both problem hehehehe