04-04-2013, 01:53 PM
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Neither of my tanks have lids, although my 35 does have the glass section for the light (though I have the light raised with two glass cups under it so my floaters don't burn...). I have noticed about an inch of evaporation per week, but sometimes less depending on how humid it is here. I haven't noticed much of a temperature difference, but our house temperature is probably much higher than yours and closer to my tanks.
The main problem I have is the cats, quite honestly. My female cat has jumped INTO the tank (that's like 4 and a half feet off the floor) twice. Like just straight up and into it.
I've never had a fish jump, even with the cats occasionally batting at the tank. The only time I had a jumper was when I was trying to catch the Gourami -____-