Open top tank evaperation - Tropical Fish Keeping - Aquarium fish care and resources

 
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post #1 of 5 Old 03-21-2012, 04:00 PM Thread Starter
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Open top tank evaperation

I was wondering how much faster do open top tanks lose water than covered tanks as far as evaporation? is it a big difference or not? was planing on possibly converting to an open top and was just curious.
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post #2 of 5 Old 03-21-2012, 04:38 PM
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Yes, more water evaporates with no cover. Water is warm, and warm water evaporates faster than cold, plus it depends upon your room temperature.

With a cover, scarcely any water actually evaporates; it condenses on the cover overnight, then most of it drops back into the tank when the lights are on. Some will evaporate, but minimally by comparison.

Issues with open-top tanks. Fish will jump out; many fish given the chance will jump, especially during night when they may be startled by other fish or something. Dirt and objects can easily get in the tank; other pets like cats, and small children, are issues. Water evaporation being faster will get into the walls and ceiling, much as it does in the bathroom; this has to be dealt with to preserve the structure. Depending upon how close to the water the overhead light fixture is, there may need to be a glass separation to prevent splashes and water rusting the fixture.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If youíre going to take it under your wing then youíre responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #3 of 5 Old 03-21-2012, 06:34 PM Thread Starter
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Thanks for all the info. and from hearing it an open tank does not sound to appealing. thanks again
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post #4 of 5 Old 03-21-2012, 06:39 PM
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I have a 20l with a glass top and a 36 with a lose fitting plastic top, I barely notice any water loss over a week in the 20long but over the course of a week the 36 will lose at least an inch of water due to the openness of the lid.
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post #5 of 5 Old 03-21-2012, 06:48 PM Thread Starter
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yeah i could only imagine how much an all the way open top would lose in a week. I have defiantly decide an open top is out of the question now.
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