02-26-2010, 04:38 AM
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As far as I know, most chillers are "in-line" devices. To get one to work, you'd want an input hose in the tank going down to the chiller, which works via gravity siphon (a pump/powerhead isn't needed) but then you need a pump to pump the water back up and into the tank. Since you're using a canister filter there, that should work as your pump. So yes, the first powerhead in the line is not needed.
If I were you, I would put the filter before the chiller for two reasons:
1) You'd have clean, debris-free water going through the chiller which should prevent problems with the chiller and
2) A warmer environment in the canister filter will promote better bacteria growth. The water leaving the chiller will presumably be colder than the actual tank temperature, so you'd have some pretty cold water in the canister in your drawing which would probably negatively affect bacterial growth.
Edit: you don't need the other powerhead, either. The canister filter has its own pump and will be able to pump the water back into the tank.
I would set this up by putting the intake for the filter/chiller line at the far end of the tank, use a spraybar for the canister at the near end and maybe use the powerheads at the near end facing the far end to generally cause current to go in that direction (essentially aiding the spraybar). How many powerheads/where you put them/how powerful they are/if you even need them is all a function of how powerful your canister filter is and how much flow you want in the tank.
Last edited by iamntbatman; 02-26-2010 at 04:41 AM..