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My 2 cents on this.

I love this thread!

What are the pros and cons of powerheads though? aren't there some pond critters / plants that want a still pond?

Anyone have an opinion on whether to move the water or not? Do you lose microfauna by moving the water around with a powerhead?
If you are familiar/w those air driven sponge filters...there is nothing that says you couldn't just use the up-draft tube from one of those for water movement. Also for more of it in the on-line stores they sell replacement tubes for undergravel filters and those are 1" in diameter. And those same companies also sell the spigots with the righ hand angle at the top
for the tube.
Since my tank has a filter it's not in here. But I built in the filter which works on the same principle using air instead of a pump motor.
I did this specifically so that baby fish/shrimp and daphnia can go through without being hurt. In the first picture the water comes in on the lower left, up and then down through the filter media and back up through a tube that lets out where the bubbles are in the second picture. It has no screen/pads that can trap those mentioned critters.
http://www.plantedtank.net/forums/picture.php?albumid=14289&pictureid=43401
http://www.plantedtank.net/forums/picture.php?albumid=14289&pictureid=43393
But you can just use the pick up tube of an undergravel filter to move water without hurting anything.
 

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If you are familiar/w those air driven sponge filters...there is nothing that says you couldn't just use the up-draft tube from one of those for water movement. Also for more of it in the on-line stores they sell replacement tubes for undergravel filters and those are 1" in diameter. And those same companies also sell the spigots with the righ hand angle at the top
for the tube.
Since my tank has a filter it's not in here. But I built in the filter which works on the same principle using air instead of a pump motor.
I did this specifically so that baby fish/shrimp and daphnia can go through without being hurt. In the first picture the water comes in on the lower left, up and then down through the filter media and back up through a tube that lets out where the bubbles are in the second picture. It has no screen/pads that can trap those mentioned critters.
http://www.plantedtank.net/forums/picture.php?albumid=14289&pictureid=43401
http://www.plantedtank.net/forums/picture.php?albumid=14289&pictureid=43393
But you can just use the pick up tube of an undergravel filter to move water without hurting anything.
I would add that, based on my experience, you can also use airstones to produce sufficient movement. Our 10-gallon has been without a filter for several months now. The only current in the tank is the result of one small airstone. It isn't much. But the tank stays remarkably clear with two albino cats, a clown loach, a bamboo shrimp, an apple snail, and twelve billion trumpet snails. I suspect this clarity has something to do with the duckweed also.
 

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The reef vase I have ran for nine years is airstone only with no filtration just like the planted vase above... Most wouldn't think the concept works with saltwater but it works just the same~
 

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Roughly 0.5g glass vase
MGOPM capped with gravel
2 revitalized Argentinian swords, salvia minima
Pond snails
Indirect sunlight from window and ambient light from other (low tech) tank's lights (6500k 13w cfls)
Only minor diatoms and hair algae





The swords have had a long journey to recovery. They started out as plants in a tube at a petco, were put in a tank and eaten by my pleco (ate leaves and roots) so all that remained was the crowns. Floated in a mason jar under sub par light in a cold room for many months. Planted in a evolve4 with [censor] lights but soil, so got roots but leaves kept dieing.. then upgraded to a vase on a windowsill with soil. Had a [Hair algae disaster], fixed and moved to bookshelf between the other picos. This all happened over nearly 2 years (just short by a month or so).. miraculously durable plant! Might have to upgrade it to bigger accommodations soon though.
 

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13mo and counting. 1.75g Betta vase with no filter or heater, 9w cfl, MGOPM, gravel and a single pot of c. wendtii housing a stunted 1 year old (1.25" head to tail) female betta

 

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Wow, that is cold. Perfect temp for shrimp.
Yeh but I'm not having lucky with my cherries (in the two picos behind the vase pictured), had saddled gals but never berried and see fewer and fewer of the shrimp..
 
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