Quote:
Originally Posted by mr.wilson
The lids will raise the tank temp at least 5˚F. They will limit gas exchange slightly, but it isn't a major concern. You will get condensation and salt creep/spray and the lids will become cloudy further diffusing light. If you are using metal halide lighting, the lids will warp considerably. Flipping them weekly helps keep them straight.
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The lids are Lexan, so I am not expecting much, if any warpage.