Unhappy with flow, need suggestions - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 04-02-2006, 01:57 AM Thread Starter
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Unhappy with flow, need suggestions

Seems like a trivial thing, but it is driving me nuts. I have two filters on my 75gal planted tank, and I can't seem to get a good flow pattern without dead spots.

Here's what I'm working with. First is a Rena XP3 with an aquamedic 1000 CO2 reactor on the outflow. The other filter is an Aquaclear AC110 (500). The aquaclear is on the left rear of the tank as you look at it and this puts it's intake in the lower left corner. Right now, I have the Rena set up so that the intake is in the lower right corner. The outflow is a drilled out spraybar that sits below and a little to the right of the AC 100 outflow.

I have tried quite a few other combinations as well. But it seems as though I always have some dead spots.

Anybody out there have this (or similar) filter setups? How do you arrange them for best flow?
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post #2 of 7 (permalink) Old 04-02-2006, 03:03 AM
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I run a powerhead attached to 1/2 PVC that runs under the gravel and has 3 jets that come out of it to avoid these dead spots. You could add a powehead somewhere. Could you make the output of the Rena run vertical in a corner, that may help


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post #3 of 7 (permalink) Old 04-02-2006, 08:58 PM Thread Starter
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Would it work better to either put the spraybar along the right side wall of the tank, facing across the tank. Or maybe on the back wall, but on the right side facing forward.

I doubt that I'm the only one running this type of filter combo. Somebody has to have found a way that works.
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post #4 of 7 (permalink) Old 04-02-2006, 10:47 PM
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I'm not sure I follow. Is the Rena's outflow below the AC? If it is, try moving the spraybar to the left side up high pointing across the tank...

On my setup I use a homemade PVC outflow low on the backright pointing into the back wall -angled up too. About 8 inches long at the bottom of the tank. One of Wasserpest's many good suggestions to me. Its spraypainted green if you want to look at my sig pic. I have an intake in each back corner. And I have a spray bar on the left side up high. I really like the flow. Its pretty strong, but the two inline heaters, UV clarifier, and one CO2 reactor slow it up a bit. And I'm going to be stealing one of the Hydors for a new 65 gallon I have on the way. And I'm pulling the Current USA UV as I never use it and save it as a one time HOB "cure" if GW ever raises its ugly head.





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post #5 of 7 (permalink) Old 04-02-2006, 11:00 PM Thread Starter
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Yeah, I have the Rena outflow just below the AC outflow. I thought that maybe combining them would help. The AC intake is in the lower left, and the Rena intake is in the lower right. I can't change the placement of the AC outflow. I'm just trying to find the best place for the Rena spraybar. Somewhere that it is not "fighting" the AC outflow.
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post #6 of 7 (permalink) Old 04-02-2006, 11:08 PM
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If you are looking for more circulation, I would ditch the spraybar, and put a J-shaped outlet into the corner opposite from the AC, pointing towards the center of the tank. You can use the Rena Jet nozzle to increase the current further.

Spraybars do a good job for even distribution of too much flow, but once the tank fills up with plants, you might be better off with a single outlet.


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post #7 of 7 (permalink) Old 04-03-2006, 01:50 AM
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I like Wasser's suggestion about ditching the spray bar.

I removed the spray bar off my 2126 and replaced it with an Eheim installation kit with a spray nozzle and immediately noticed an incredible increase in over all circulation.

I think replacing your spray bar for a nozzle may do the same for you, too.

Mike

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