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Re: Aquatic Plants Digest V1 #73
> Subject: Cover
>
> Steve in a prior issue mentioned glass covers between the tank and
> the light bulb. Let me just give you a quick warning here that glass
> works as an Ultra Violet filter. Personally I have had much better results
> with plexi-glass covers.
I have found that plexi-glass will severely warp with the humidity
differential between the aquarium and air. Filtering UV should not
be a concern because the glass around the bulbs has already filtered
most of it.