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[APD] Heat exchanger - was aluminum in the aquarium
I finally got my aluminum radiator installed and got it to actually work. I
used an aluminum transmission oil cooler from the local auto parts store.
I'm getting about a 3 degrees F drop over the 13 1/2 hour night. The 90
gallon tank has three 96W CF lamps, two on for the entire 10 1/2 hour
daytime, plus one on for the middle 3 hours. This is a reduction from an 11
1/2 hour day with all three on that sent the tank into a high temp death
spiral into the high 80's. (CO2 injected from a cylinder, ferts added mostly
Now it tops out at about 78 degrees and falls back to 75, in a room at about
72 degrees using a 1200 CFM computer fan to pull air across the radiator.
(The fan is rated at 11 dB so air volume was traded for less noise.) So it's
a mixed bag in terms of how much the radiator helped, but if I really chill
the room I can feel the heat in the exhaust air so it's gotta be helping
Everything in the tank has perked up and I'm curious to see the long term
effect of the shorter days on growth rates and algae. If, as the other Tom
says, I can modulate both with the lighting, then that would be a good
PS: I've noticed that when the tank hits the 'sweet spot' and the plants are
pearling, that is when algae vanishes. Is it possible that the algae is
being 'oxidized' by the high oxygen level?
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