On Wed, 24 Feb 2010 21:22:56 +0000, john hamilton wrote:

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Many thanks to all. I want to lift it out to clean the gravel which gets
a kind of dark green algea growing on it after six months or so.


Go to the pet store and get Algae Destroyer Advanced. It's a lot simpler
solution than a tray.

Also read up on algae. Normal causes are overfeeding the fish or too
much light or overstocking. If you have enough live plants in the
aquarium, they'll out compete the algae and use up a lot of the fish
waste as fertilizer.

There's a lot of info on the web on keeping an aquarium.

--
Intelligence is an experiment that failed - G. B. Shaw