Re: Eutrophication and mulm (was Allelopathic chemicals)

[Jared Weinberger <jared at brainyday_com>]

Daniel Larsson <defdac at hotmail_com> wrote:

<<Because another thing I've thought about is how canisters aerate the 
water. They contains a serious amount of oxygen demanding bacteria so the 
water from the pump should actually be oxygen depleted? Is the 
surface-disturbance the only way a canister filter aerate the water column? >>

Canister's don't aerate the water (except for any disturbance caused by the 
return). They provide a better growing environment for the aerobic bacteria 
thanks to the high flow rate of O2-contining water through the media. The 
oxygen needs to be supplied by plants and surface exchange.

Jared


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Jared Weinberger
http://www.brainyday.com/jared