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If i have a Canister filter do i still need to have Undergravel filters and powerheads.

Posted By: Zach Grimm <zpgrimm@Earthlink.net>
Date: Sunday, 12 March 2000, at 3:26 p.m.

if I HAVE AN Ehiem canister filter what does it do, does it filter the water and put more oxygen into it and i have a whisper 20 power filter on my tank right now and that does not put air into my water someone please tell me what a canister filter does, does it put oxygen in the water and filter. Like if i had a 30 gallon tank would i just need a canister filter and a heater please help.
 

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