Most of us have lights on standard christmas light timers which
are set to turn on and off at certain times. However, we sometimes need to
accomplish stuff (say turn on an airstone) when the lights go out.
To automate this, get a cheap blub-type night-light. Take it apart
to get the circuit (with the photosensing diode). Connect the airstone or
whatever device to where the bulb would be and place the photosensing
diode close to the lights in the hood, connect the plug-end into an
outlet. Voila ... an anti-timer :). This does require some minor DIY
electrical work and you have to be careful since its going to be near
water.
And, Martin, I am able to get elliptical currents using one single
(but powerful) powerhead. I placed at the bottom on the right side in the
middle of the tank. The output is pointed at the middle of the front
glass. With all plants, obstructions in the center of the tank, the water
flows readily along the sides in an elliptical pattern (easy to see when I
dump in some sinking pellets). This is my "river" tank and the shiners
appreciate the current.
Sajjad
On Thu, 1 Feb 2001
Moontanman_at_aol.com wrote:
> In a message dated 2/1/01 8:34:11 AM Eastern Standard Time, ichthos_at_charm.net
> writes:
>
> << This is fascinating. How are you applying this in your tank(s)? To what
> benefit?
> Is there a perceived difference in the behavior or health of the fish? Which
> fish stand to benefit the most? Or is the benefit simply aesthetic?
> >>
> You can put a powerhead in the opposite corners of the tank and put them on a
> timer so that they cause the water to reverse direction every six hours. It
> simulates tidal movement. Works great in marine tanks and in freshwater too.
>
> Moon
>
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