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Old 10-10-2004, 08:15 PM   #1
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Fan in Hood

I'm thinking of adding a computer fan to my tank lid...but I don't want it to cause more evaporation in the water so that I have to do more top-offs.

Basically, if I take the lid off my tank then my tank temp. goes down about 0.5°C (when the lights are on). So I'd like to keep the lid on but blow all the hot air out...

There's a hole I've made in the right of the lid (where all the filter pipes fit through etc.) so do you think I could mount the fan at the left of the lid and have it blowing the air across to the right? This shouldn't cause any extra evaporation should it? And do you think it'd be efficient in cooling my lid down?

Are computer fans very quiet? Or even silent?

And, would it be possible to put a thermostat onto it with little effort (and make the fan and thermostat suitable to be in an aquarium lid, ie. encase them or whatever) so that the fan turns on or off with the heat??

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Old 10-10-2004, 08:32 PM   #2
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I bought 2 fan on ebay dont remember where. I don't even know they are running and they have a sensor on them for temp control. I think they run 24/7 never checked because as i have said they are quiet.
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Old 10-10-2004, 08:56 PM   #3
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So they're in your hood? Is there a hole in your hood for the hot air to get out of? Does it cause more evaporation?
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Old 10-10-2004, 08:57 PM   #4
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Evaporation is what cools the tank down so you can't really have it both ways.. the fan will definitely increase evaporation.
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Old 10-10-2004, 09:03 PM   #5
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Well, as soon as I open my lid all the hot air comes out (you can feel it) and then the tank temp. slowly goes down about 0.5°C over a couple of hours. This is just with the lights on of course.

I don't do any top-offs because I don't need to (tank level doesn't go down much and SG doesn't increase/decrease over the 2 weeks until I do a waterchange).

If I put a fan in there and keep the lid down, won't it just do the same job as opening the lid and just get the hot air out of the top of the lid? ie. not cause extra evaporation like opening the lid doesn't? The fan won't be blowing onto the water because there's an acrylic sheet above the water that the lights etc. sit on, then the wooden lid is placed above them.
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Old 10-10-2004, 11:27 PM   #6
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When shopping for fans look for something with a sound rating of 22 dB or less. You won't be able to hear it unless you put your ear to it.
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Old 10-11-2004, 05:36 PM   #7
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I have them hanging on the back of the canopy blowing in to bring in cool air and there is a gap on the top of my canopy where the hot air gets pushed out. I cut no hole in my canopy... I know guys who run one blowing in and one out
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Old 10-11-2004, 06:19 PM   #8
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If I put the fan at the left and blow it across the lights to the right (where the hole is) do you think it'd get rid of the hot air? And presumably not cause any extra evaporation because it's nowhere near the water?
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Old 10-11-2004, 06:29 PM   #9
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I mean no offence here.

Curio says that you are going to a lot of trouble setting up your tank, yet you are trying all ways of getting out of toping up maybe a ltr or so a day?

Is it cos you don't have an RO unit or storage for water? I change 10% per week & topup 1-2 ltrs per day & I don't use maybe 6 gal per week all in?

Cheers Shelton.
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Old 10-11-2004, 06:32 PM   #10
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It should help can't telll you about the evap because all tanks are different.
Why so worried about some extra evaporation?? My tanks get topped of every day so your lucky if you can go 2 weeks betewwn them. Top off's are just part of the hobby.
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