Sorry Giancarlo, I have to disagree with you on this one. I have seen canister filters tested with food coloring in the water to watch the circulation pattern... as I have seen the same tests performed on HOB filters and internal filters. Some of this does change depending on the length of a tank, but in general, most situations with a canister filter showed that the intake actually draws up the water in the immediate area, and while the spray bar will help to provide circulation, it doesn't reach as far as we would like to think, and the opposite end of the tank ends up with dead spots that don't get circulated enough to make it to the intake. The biggest area of dead spot for this is the lower, opposite end of the tank (when the intake and spray bar are on the same end and spray bar is at or near the surface). In a situation with spray bar on the opposite end of the tank, in a long tank with no powerheads, the results showed the biggest dead
spot to be the upper area on the end of the intake. Most large tanks (over 30 gallons) with a canister filter can greatly benefit from the use of a small powerhead.
Dawn
Dawn Moneyhan
Aquatics Specialist/Nutritionist
To learn more about me go to
http://www.helium.com/users/449334
--- On Mon, 8/30/10, tuvix72 <no_reply@yahoogroups.com> wrote:
From: tuvix72 <no_reply@yahoogroups.com>
Subject: [tropical fish club] Re: Unusual behaviour?
To: tropicalfishclub@yahoogroups.com
Date: Monday, August 30, 2010, 12:19 PM
Dawn, assuming the return is pointed sideways, as it should be, you'll actually find that the dead spot is right there under it as the current is being pushed to the opposing end of the tank. There's nothing wrong with placing both intake and return in the same corner...
Giancarlo
--- In tropicalfishclub@yahoogroups.com, Dawn Moneyhan <dawnshungryeyes4u2c@...> wrote:
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> Are the intake and output tubes in the same area? Those should be positioned on opposite ends of the tank from each other. If they are positioned near each other the filter continues to recycle the already filtered water while not pulling in water from the uncleaned end of the tank.Â
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> Dawn
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> Dawn Moneyhan
> Aquatics Specialist/Nutritionist
> To learn more about me go to
> http://www.helium.com/users/449334
>
>
>
> --- On Fri, 8/27/10, J Wilhelm-Sweeten <shobxrs2@...> wrote:
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> From: J Wilhelm-Sweeten <shobxrs2@...>
> Subject: Re: [tropical fish club] Re: Unusual behaviour?
> To: tropicalfishclub@yahoogroups.com
> Date: Friday, August 27, 2010, 1:24 PM
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> I change 1/3 of water every 2 weeks and use API's Stress Coat Plus for the water changes. This tank is also a planted tank and has been established for a year. I have a 20 gal. long that I change at the same time, using same products, but don't see this happening in that tank. I have a Eheim canister filter and the flow and return lines are set up at the corner of the tank with moderate flow.Â
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> Jill S.
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> --- On Fri, 8/27/10, tuvix72 <no_reply@yahoogroups.com> wrote:
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> From: tuvix72 <no_reply@yahoogroups.com>
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> Subject: [tropical fish club] Re: Unusual behaviour?
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> To: tropicalfishclub@yahoogroups.com
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> Date: Friday, August 27, 2010, 11:19 AM
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> As long as the return from the filter is causing some surface agitation/movement you should be fine as far as gas exchanges go, these are responsible for maintaining oxygen levels in the water. The height of the waterline doesn't really matter, it's more important the positioning of the return from the filter.
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> Can you tell us more about your water changes and products used? For example how much you change each time and which product you use. Some water conditioners do deplete oxygen in the tank when used, but should be back to normal overnight. Could also be from other elements in your tap water that are not being removed... Knowing more about this will help us get a better idea.
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> Giancarlo Podio
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> --- In tropicalfishclub@yahoogroups.com, J Wilhelm-Sweeten <shobxrs2@> wrote:
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> > Everytime I do a water change in my 65 gal. tank for the next few days after my fish seem to want to stay up at the surface, as if they need oxygen. My #'s are all at good levels when I check. I have a glass top covering the tank. My husband things I fill it too high and they aren't getting enough oxygen. I have a canister filter. I fill the tank up to about 1/4 - 1/8 inch from the top. Am I filling it too full and are they trying to get oxygen?
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> > Thaks for any input.
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