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Old 12/20/2006, 04:26 AM   #1
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1 gallon evaporation a day in a 46 gallon tank too much? MH 2.5" from water.

I am running open top on my tank and have my metal halide light 2.5" from the water, I noticed I evaporate almost a gallon of water everyday from my 46 gallon tank, is this too high a rate of evaporation?

Is evaporation as bad with t5's as it is with metal halides?

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Old 12/20/2006, 04:39 AM   #2
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I believe most people are about 5-6" away from water with mh

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Old 12/20/2006, 04:46 AM   #3
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Assuming your MH is shielded from salt spray hitting it, you could be ok...but it is definitely close. If you are having problems with excessive heat, coral bleaching or evap, you should raise it.
BTW, near a gallon a day of evap is not excessive. I have about that much on my MH is 13" off the surface.


~The perception is that perception is reality, but the reality is that it isn't.

Current Tank Info: 75g mixed reef; 135g mixed reef
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Old 12/20/2006, 04:47 AM   #4
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t5s would definitely create less evaporation than mh does. A gallon of water is not bad IMO for an open top tank.

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Old 12/20/2006, 03:09 PM   #5
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that's fine, my house is very dry in the winter and i can do 3-4 gallons in a 24 hour period no problem. that's from a 120 with probably 35-40 more in the sump, so just about the same percentage.

i'm not a real doctor, i just play one on tv.

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Old 12/20/2006, 04:03 PM   #6
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Light Loss

With your MH lamp so close to the water, some of your light is "leaking" through the upper portion of your glass or acrylic walls. If your light is higher, the light will be reflected back into your tank.

Try an experiment:
- Turn off all lighting in your room except for the MH lamp.
- Watch for "glitter lines" on the floor and walls of your room.

If you raise the MH, you will not see as much "glitter" in your room. They will stay in your tank.

Alternatively, look through the glass with your eye below the water surface. If you can see the bright MH lamp, then the light may need to be raised.

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