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tank covers

Have any studies ever ben done on the comparative effectiveness of glass
versus plexiglass covers in transmitting light for plant use?  I have one
side of my 90 gallon tank covered with a sheet of plexiglass which is
relatively easy to clean.  The other side is covered with a sheet of window
glass which has developed water stains which don't come off with white
vinegar, acetone, or distilled water.


Tom Zaccone