Powerhead for flow - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 3 Old 10-10-2009, 01:47 AM Thread Starter
Powerhead for flow

So I have a tall 45 gallon tank I got a powerhead today for the bottom of my tank to move water. the top of the tank is moved by the flow off the filter. My question is there anything to worry about running this powerhead in my tank. Right now I only have 2 tetras in there but plan to setup a community tank, right now the two fish love it but will all the other fish like it?
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post #2 of 3 Old 10-10-2009, 04:56 AM
MoneyMitch's Avatar
just dont get fish that will be blown all over by the flow
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post #3 of 3 Old 10-10-2009, 04:02 PM
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The amount of filtration, including the extent of the water flow caused by that filtration, depends upon what fish you intend to maintain in the tank. And whether or not you want plants also has a bearing.

If the 2 tetras were neon tetras, and you intend acquiring more similar tetras, they do not need heavy filtration and they will be better in a very gentle water flow as they would have in their native habitat. Large fish produce more waste and generally speaking require stronger filtration to move the water so the waste can be trapped in the filter. And some species of fish come from faster-flowing streams and benefit from more water movement.

I mentioned plants; they do not do as well in tanks with stronger water flows because they are inhibited in their ability to absorb nutrients from the water. Plants vary a bit in this, but generally speaking the water flow in a planted aquarium should be minimal. But the selection of fish also has an impact on this as mentioned.


Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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