tank current, water movment - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 6 Old 11-05-2009, 02:30 AM Thread Starter
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tank current, water movment

i was just wanting to know if there are any products that i can buy that can make your water in your tank move like that there is a current in it, something so that it will make my plants sway side to side with out bothering the fish to much, or is this not a good thing to do ?
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post #2 of 6 Old 11-05-2009, 02:50 AM
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You might try googling ..HYDOR KORALIA PUMPS they will provide a current that is dispersed over a wide area of the aquarium. I was turned on to them by another member here and they work very well.
Powerheads can also be used.
Many believe the plants will benefit from the water movement. Personally, I have found that plants like java fern and anubia attract less algae when a slight current is present as opposed to plants being placed in an area with little water movement.
As mentioned, The KORALIA pumps were suggested to me when i too was searching for a little current to benefit some of the fish I keep. I selected the KORALIA 2 pump for an 80 gal tank and am pleased with it's performance.

The most important medication in your fish medicine cabinet is.. Clean water.
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post #3 of 6 Old 11-05-2009, 06:54 AM
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What pump & tank do you have for starters?

Most importantly what fish do you have? Some fish LOVE a current others absolutely do NOT. So personally I'd base this decision of off what fish you got.
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post #4 of 6 Old 11-05-2009, 07:49 AM
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I have 2x Koralia 1's and they are doing well in my tank. I have them mounted on the back blowing towards the front of the tank for water movement so it's circulating width wise from back to front. though I think my gouramis prefer not to have such a strong current in the tank.

-=+8 Gallon Planted+=-
1x Honey Gourami
2x Otocinclus Affinis
6x Flame Tetra
6x Ember Tetra
2x Apple Snail (Hitched on Rotala)

Dwarf Sagittaria
Ludwigia Repens X L. Arcuata
Staurogyne Repen
Cryptocoryne lutea
Cryptocoryne Wendti
Cryptocoryne spiralis
Amazon Sword
Java Moss
Java Fern
Anubias minima
Water Primrose
Pogostemon Yatabeanus
Limnophila sp. 'mini'

Last edited by CamryDS; 11-05-2009 at 07:53 AM.
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post #5 of 6 Old 11-05-2009, 11:46 AM
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Just summing up and expanding a bit on the good advice from prior posts. Water current should depend upon the needs of the fish. And in a planted tank, there are some issues as well, that have to be balanced with the fish's requirements.

Fish that come from faster-flowing streams benefit from more current. I have a trio of Tatia perugiae (Spotted Woodcats) in my 115g, Amazonian fish that live in streams with a current. When I first introduced them to my former 90g tank, they took up residence in two pieces of standing driftwood at the end nearest the outflow from the filter. This didn't really click with me until I set up my present 115g tank in July and moved the plants, wood and fish from the 90g into the new tank. I moved the wood with these fish inside it, they remain in tunnels all day so it was easier than forcing them out into a net. I placed one piece (with one fish) at one end that happened to be under the outflow from the filter, and the other piece with two fish at the opposite end of the five-foot tank. Within 3 days, the two fish that were living in the wood at the opposite end moved house and took up residence in tunnels in the wood below the filter outflow, so now all three are in this wood. I realized it was because of the increased current from the filter; that's what they like.

On the other hand, someone mentioned gouramis...they should always have minimal flow in the tank. They occur in slow streams with scarcely any movement, or more often in jungle swamps and ponds with no movement. Fish from such habitats should have a quiet environment in the aquarium in order to be less stressed and more likely to exhibit natural behaviours. Most (but not all) of the common fish we maintain (excluding livebearers here) are forest fish that occur in quiet dimly-lit streams or flooded forests with little active current. It is important to know the needs of the fish when setting up a "community" aquarium, since fish with identical or similar requirements respecting water parameters, habitats and environmental factors will be healthier due to less stress.

Then we have the plants. Water movement is helpful, because it brings CO2 and other nutrients to the plant leaves faster. However, studies have shown that excessive water movement actually inhibits the plants' ability to absorb nutrients, plus the fact that it drives CO2 out of the water faster. Plants need CO2 in order to photosynthesize, and for those of us with low-tech "natural" aquaria the CO2 comes from the fish respiration and biological processes and can be in short supply. It would be counter-productive to drive it out of the water before the plants can use it.

I would never have currents that make the plants sway or even move, except those nearest the filter outflow. It is no accident that brush algae always occurs first (and most) next to the filter outflow in a stronger current. There is probably much more to this than most of us comprehend, so going with the best for the fish seems the preferred route.


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]

Last edited by Byron; 11-05-2009 at 11:50 AM.
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post #6 of 6 Old 11-07-2009, 11:40 AM
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I always used a submersible fountain pump. The ones that come in cheap tabletop fountains. It worked especially well for my darters. :) Of course the tank wasn't really a large one so it may not work as well on a big aquarium.
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