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.