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Where shouldi place it in my tank how high, how low. Should i use it where bubbles come out the water flowy thing or just a water shoots out like a stream.??
Also its for a Asian River Biotope

Hi and Welcome to Fish Profiles.
Because you are attempting to reproduce an "Asian River"
one would normally place the power head at one end of the
tank or the other forcing the output to travel across the
width of the tank. The inputs for the pumps should be at
the opposite end so the flow is all in one direction.
As to the placement of the pump in the water column
(near the surface, in the middle, or just above the
bottom) I would say that it would depend upon what fish
you are planning on housing in the tank. If your fish
live toward the surface and in fast flowing streams, the
a shallow tank with the pump at, or just below the surface
would be ideal. If they prefer the bottoms and the high
currents, then I'd place the pumps just above the gravel.

As far as using the bubbles is concerned, if the fish are
from fast moving streams that are broken by rocks and
rapids, then I would use the bubbles to increase the
oxygen in the water and give them something to frolic in.
Bubbles can be (create) problems that range from
inconvenient such as condensate forming on the glass tank
cover, to dangerous such as the increased corrosion of
electrical connections in the tank light assembly. If you
are going to use bubbles, then by all means have a glass
cover between the tank light and the tank surface.

Here is an article you should find interesting:
http://www.loaches.com/articles/river-tank-manifold-design

Hope this helps...
Frank


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