Water flow for planted tank - The Planted Tank Forum
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post #1 of 5 (permalink) Old 10-23-2015, 03:01 PM Thread Starter
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Water flow for planted tank

Hi

I'm currently using a spraybar for the outlet for my 2ft planted tank

My inlet is positioned on one side of the tank and the spray bar on the other side

Canister filter is running at 400L/h - should i add another powerhead or will this be enough flow?

thanks
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post #2 of 5 (permalink) Old 10-23-2015, 04:36 PM
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I converted the 400L/H = 105.669 gallons per hour
You say it's a 2ft tank, I assume it's a 15 gallon or 20 gallon tall.

I'd say there should be just enough flow, a bit on the weak side, but enough. See how well the flow does, if you have tiny dust/debris particles in the water they are great to see how the current of water travels throughout the tank. Some like to see the plant leaves "blow/wave in the wind/current" so that can be an indicator. Before trying a powerhead, play with the spray bar angling to see if changing it's aim makes the flow throughout the tank any better.

It does vary, since if you do have a lot of plant mass, it can block the water flow to the other plants, so then you might want a additional powerhead (circulation pump preferred, more wider dispersing flow).
After some time, if certain types of algae (thread, staghorn?) are growing on the plants, I believe that may be a sign of poor water flow in that area.
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post #3 of 5 (permalink) Old 10-23-2015, 04:40 PM
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Flow might be better with the spraybar and inlet on the same side of the tank though. Point the holes straight across the tank an inch or so below the water surface. Water hits the far side, slides down and filters back slowly to the inlet.


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post #4 of 5 (permalink) Old 10-24-2015, 06:10 AM
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I would place the inlet and spray bar in the same corner. The inlet near the bottom point to the front ie parallel to the width; and the spray bar parallel along the length pointed at the rear opposite corner. This will give a somewhat circulating flow broken of course by obstructions (like plants and hard scapes) which would create greater numbers of circular motions setting the entire water body of the tank in motion - that is what we wish for in a planted tank.

The rate of flow does not matter - what matters is all the tank water should move.
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post #5 of 5 (permalink) Old 10-31-2016, 07:10 PM
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As WaterLife mentioned, you have barely enough flow if you are talking about filter flow. If you are talking about overall flow, you will need to double your output with a powerhead or wave maker combined with your filter. You need about 750 L/H, combined.


eric




Quote:
Originally Posted by WaterLife View Post
I converted the 400L/H = 105.669 gallons per hour
You say it's a 2ft tank, I assume it's a 15 gallon or 20 gallon tall.

I'd say there should be just enough flow, a bit on the weak side, but enough. See how well the flow does, if you have tiny dust/debris particles in the water they are great to see how the current of water travels throughout the tank. Some like to see the plant leaves "blow/wave in the wind/current" so that can be an indicator. Before trying a powerhead, play with the spray bar angling to see if changing it's aim makes the flow throughout the tank any better.

It does vary, since if you do have a lot of plant mass, it can block the water flow to the other plants, so then you might want a additional powerhead (circulation pump preferred, more wider dispersing flow).
After some time, if certain types of algae (thread, staghorn?) are growing on the plants, I believe that may be a sign of poor water flow in that area.
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