04-19-2011, 11:15 AM
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Originally Posted by Byron
My only comment is that my tanks have run for years just as you have described. I have glass covers on the larger and the normal hoods on the smaller, and these are not airtight so there is more air circulation than you might think. But in the morning the glass and hoods are covered with water that has condensed from the tank, since the water is warmer than the air, and it drips off heavily. On the morning I do the water change the amount of water than can run off one piece of glass is quite remarkable. Once the lights come on it obviously evaporates faster until the glass under the lights is dry. If your water is hard, the whitish deposit left on the glass will be the minerals, and that needs to be cleaned off weekly during the water change; even a very thin "haze" will significantly block light penetration.
Aside from the tank issues Dawn mentioned, having all that water getting directly into the room is not good for the house. Just like in a bathroom after a shower. Water condensing on the walls and ceiling will penetrate the surfaces. Best to limit that, and a good fitting hood/cover on the tank does.
Thanks Byron, It does leave a white haze on the lid I didn't put much thought in it being minerals and needed to wiped clean. I will start doing that with water changes.